Which lines are you referring to for "two stations on either side are too close?". Future Station only has Churchill Station nearby, with Stadium a long ways down the line. And while Future is probably too close to Churchill to really justifying building it out, the blocks sizes wouldn't be an issue. Look how close Bay is to Central (which, Bay was in fact recommended not to be built because of how close to Central it was). The way the blocks are already built, inbound trains from the Northeast often get stopped in Future waiting for Metro line trains to clear Churchill Junction so certainly no issue there.
On the topic of blocks... the green paint that person was gushing over in the video is an insulated joint that is part of the signal system. I have news for her. That installation dates from the 2010's when the NE Signal system was rebuilt. She had other inaccuracies throughout mind you.