Dunno how it will affect things, but Sheik was on the draft to the facility in the first place whenever that was, so he would know the basic layout of most of the building. So for navigation purposes, he might be handy, depending on how much the thing has distorted the building since then.

Beyond that, he's got all the ninja speed, stealth and attack styles. Flexibility and small size make him good for squeezing into small spaces. Unfortunately, unless the thing has eyes somewhere, Sheik's magic is about useless. By physical abilities alone though, he still should be able to keep up. he takes orders well, and prefers to do so, but can and will take up a position of leadership if it becomes necessary. He also doesn't actually know anybody, so there's no real preference where he's put.

US EST but I stay up until stupid times, like five and six in the morning some nights.

I agree that's probably a good place to put Sheik. He's got a good watchful eye, so he can keep track of things from that angle too. Actually, now that I think about it, Sheik's illusion magic might not be so useless. As long as he's got all the details, he can make a sort of mock-up map thing or pictures so others can see what he's thinking. Less effort and time wasted with drawing things on paper. He can give everyone a rundown of what he remembers that way beforehand - so that way there's a visual to go with the information presented.

No problem!

all good