That gap at the entry door cabinet panel does not continue to grow. The worst gap I've ever seen was maybe 1/2"-5/8", most are ~3/8".
Your earlier post about using rods to tie together the roof wouldn't address the cause of the bowing side wall - the structural discontinuity of the door opening. There is simply no way to reinforce the structure without adding a lot of reinforcement to both the roof/wall connection and aluminum framing on either side of the opening. There's already a solution that works, I'd go with that.
Maybe it's more of a mental exercise aimed at GMCs that don't have the perpendicular wall panel immediately adjacent to the door opening?