well, but I HAVE to hire someone to take the remains of that one and the other one down as it is too dangerous for us to fell it.....and it could do a whole lot more damage than what is already done....with a crane & ropes they will take it down in sections in a safe, controlled fashion....and if the have a commercial grade chipper (which they should), most of the branches would go through that and it would just be a matter of the trunks.
I think that you should add a couple smaller, low roosts. They can be temporary. (I made one out of a plastic 'outside side table') screw a scrap block of wood at opposite, diagonal corners, then screw a piece of 2x2 or 2x3 cut to length to each of those two blocks and 'viola' a lower in height, ~ 2' roost....can be moved later...gives them space to run under plus another roost in the coop. The beauty of this roost is that it is lower than (I think) your primary permanent roosts, so the older/bigs will prefer those higher ones, but this still gets the youngsters up roosting. And, if you no longer need it in the coop later on, it becomes another hide/run under/through/roost on area in the run as both obstacles and enrichment. I got mine for free....you could probably hit a tag/garage sale and find something that would work just as well. ?an old wooden chair (add a roost on the seat to get them roosting) A night stand? (take the flimsy back off if it is enclosed so it becomes a 'run through' as well as a roost on top, etc/, etc., Ohhh...low coffee tables work WONDERFUL, too!
I agree with
@drstratton - put it in the run.....also gives them extra protected space for when it rains/snows, etc. That said, does it by any chance have 2 doors/openings? Less likely for them to get trapped in there by the bigs if so.