I cannot think of any reason why #4 would be installed in Niagara Falls and not in Jacksonville.
That doesn't mean components aren't put together and tested before shipping but thee is no reason to have another processor running in a site where they cannot get enough plastic anyway.
Jacksonville has unlimited plastic (raggertail) and is where they need to focus once 33 is up running fully permitted and profitable.
I agree from the photo the only place you might have room is behind the photographer. It supports the plan to not use the room for production but test and ship.