Looking at the current roster after the signings, I see more work needed at:
Safety- starter needed. This is the only position as of today with a high need.
DT- upgrade/depth - they have Jarrett, Dexter, Gallimore, Street. I see Turners physique as another DT more than DE.
Finding at least one prospect that can push for a starting job with Jarrett and Dexter both possibly gone after 2026. Turners health and progress could mean 2 are needed.
DE - upgrade/depth- Montez/ Dayo/ Booker are a pretty decent rotation but finding another prospect to push these guys for production/sacks is needed.
WR - depth - with Moore and Zacheous gone, the Bears need another body. That is a lot of snaps to replace. Walker will see a lot but another talent will be needed
LT- Wildcard - the Bears have bodies. Trapilo, Jones, Willis, Benedet, Armagadjie to audition. The draft doesnt have many true LT prospect but Monroe Freeling who will be long gone. I think the Bears go with the 5 guys.
C- depth - Bradberry could turn out good, he fits the scheme but the Bears would be smart to get another prospect. I like Newman, but feel he will be best to learn guard.
RB- depth - Swift and Monongai are a nice tandem, but the Bears might surprise us if the right player is available to draft and develop as SwiftKey replacement.
I am sure there are other positions with needs or upgrades but Safety and DT to me are the biggest.