So we finally get to see Church directly break something big. Rather curious Pate hadn't already just used him to retrieve this (since Church's bulldozing ability might seem to make Alice and Sedna not necessary). I guess something about Gavia and/or Ardent presented an opportunity or timing that didn't exist before. Or maybe Pate just wanted to use Alice and Sedna like he's using Church, as resources for... something else. The way the door is bypassed doesn't look like knocking the entire thing backwards at high speed. A more surgical, get the door out of the way sort of thing. Relying on Ardent in case a flying door hit a shuttle seems more than just arrogant and risky, seems foolish. After all, instancing a flashlight into a floating light isn't necessarily like magically repairing a smashed and crushed orbital shuttle. Even if Pate thinks Ardent is capable, why test it, especially if this is the only well-preserved "easily" reachable shuttle.
There might be some other exit that used to open where ships could fly from or be launched out of, unless one part of all the Blink stuff was some other kind of ultra high-tech way of getting ships out from an hour's walk down. Although given that the group had to physically take that hour to move down - and that there was a path to do so - at least suggests a more mundane physical answer. Seems impractical to use cranes to lift them out, and too lengthy to disassemble and reassemble by pieces after all. If the answer is there is some other exit for vehicles, it seems likely currently not easily reachable for actual ship-launching purposes. That would seem to be a reason that Pate would need some large amount of assistance aside from Church to retrieve it, although of course retrieving it is just the first step of many that might need much more help even.