#or have daisy being injured so she can't quake

[ryder616]

Plot Contrivance, thy name is Season 6...

S.H.I.E.L.D. learns in 6x05 through Benson's research that the crystalline spikes that erupted from shriked!Keller (R.I.P. Boyfriend Plot Device) are similar to the monoliths’ molecular structure.

The reason why Benson compares them to the monoliths is because Elena, who is not a scientist nor has any kind of scientific training that we know of, nonetheless immediately picks up the similiarities between the scan of a dead shrike and what at some point she must have seen of a monolith (when? I don't know/recall. She was stuck in bed during the Fear Dimension crisis but she’s smart and inquisitive, she probably asked for details of what was going on. It’s not important. What matters to my following points is that the Plot requires the character to remember and the character does, even if it happened off screen and it’s easier to come up with reasons for why she wouldn’t).

In 6x07 Fitz and Simmons learn that Izel is after the monoliths. This Fitz doesn’t know about the Monolith Triptych in the Lighthouse (he learns of their existence by 6x10) but knows - or should know - a hell of a lot about the Space Monolith that transported Jemma to Maveth (2x22). He studied it obsessively for six bloody months. And he eventually figured out how it worked (3x02):

Quantum harmonic oscillation theory, like the professor said. [...] It's a strange shape for this time period because it's made to resonate, uh, to create a-a quantized field within the stone.[...]The room is a speaker. The machine is an amplifier. Uh, a sub subsonic frequency to resonate with the Monolith.

And, interesting point, while Coulson & co. during this explanation were exchanging dumbfounded looks, Daisy was actually following along and came to the conclusion on her own:

I can do it. I can open the portal myself. If the point of the machine was to resonate the room at a certain frequency, I can do that.

So. Fitz knows that at least one of the monoliths can be activated by a subsonic frequency that Daisy can produce and saw it happened. Daisy also knows this because she made it happen and knows that she accidentally reduced that monolith to pebbles (Fitz of course knows this too as he ended up covered in them). If Izel wants the monoliths, being able to destroy them could be useful, yes? And Jemma also knows all of this because it’s how she was saved and because she then studied how she was saved to find a way to rescue Will.

So, why does none of this ever come up? Elena immediately spotted the similarities between those two scans, one of which she must have seen more than a year earlier yet FitzSimmons - trained genius scientists - and Daisy - who’s quite smart if lacking academically - can’t see any possible connection nor, apparently, have any recollection whatsoever of such a pivotal event in their lives? Daisy almost died. Fitz and Simmons were almost lost forever. Are we supposed to take in that none of it could be relevant to the current crisis?

Then in 6x11 we have this gem:

Fitz: This sword is a more complex version of these other blades. Simmons: Which were able to kill her shrike. Fitz: So, Sarge's hypothesis that the sword could be used to kill Izel does have merit. Simmons: The metal has a familiar crystalline structure. Fitz: Like the monoliths. So it could be reversed-engineered  to manufacture more weapons. Daisy: None of this matters unless we can get within stabbing distance.

So. A familiar crystalline structure that is like the monoliths still doesn’t trigger any recollection in our resident geniuses to arrive at the conclusion that resonant frequencies might be relevant to Izel’s powers and vulnerabilities until Deke gets there on his own, catching on something Sarge said (to Daisy). While Daisy, who was able to destroy a monolith with her powers - yes, by accident. Accidents can be replicated, real life scientific discoveries have been made this way - is worrying about stabbing distance. Well. Okay then.

And since I don’t want to leave anyone out of this embarrassing dumbfest, during the exchange I quoted, Deke comments that he saw firsthand how effective the blades are against the shrikes, a reference to May stabbing one right before it shut him up  entered his mouth.

However, FitzSimmons the Younger has apparently forgot all about how Daisy turned a bunch of those same shrikes into dust. What, that did not make an impression? That isn’t relevant either? Not even a little bit? Not even to at least have Team FitzSimmons say “too bad we can’t have Daisy doing that because *insert sciencebabble BS reason of choice*”, so during the finale we aren’t left wondering why Quake is suddenly useless?