The screws attaching the rotors are not supposed to be re-used as they are coated. I have re-used them twice, checking them through 17K total thus far and noticed none have loosened, even without using a thread locking compound. I have a set of 12 brand new bolts on-hand should I decide to bail on this.
I notice in past discussions regarding the rotor and removal, others have opted to use some thread lock when they reuse theirs. Do some searching, my opinion is not the be-all-end-all on this issue.
The floating disk design is very difficult to determine if it is bent or not, and the replacement is very expensive. I can make the rotor act warped simply by choosing to do a hard stop, and then return it to normal by riding and some gentle stops. I chose to be safe rather than sorry, removing is easy prior to tire replacement. Even transporting the front wheels represents a risk best alleviated by removing the disks.