BB and I suspect other coaches plan the off season player acquisitions around
a) signing veteran FAs,
b) signing Draftees and
c) signing UDFAs.
Trades are few in the league, and BB at least, uses them only after every other exigency has been tried and found wanting. So they tend to come toward the end of TC.
BB wants his teams to have 'no holes', even if the occupants are sometimes very average players. We all perceived a hole at TE2 and S2. BB is using the three-headed S combo of Chung/Wilson/Ebner to fill one of those holes, and traded for Tim Wright to fill the other hole, while opening a vacancy hole on the offensive line.
Before making the trade to 'Get' Wright, and 'Give' Mankins, BB must have figured that he had Marcus Cannon available who could fill Logan's vacancy at least adequately. he knew he needed a swing tackle for depth.
We are seeing Cannon's growing pains, and complicated by the mysterious problems that Solder is having. But in perspective Solder has only given up 2 sacks, but has allowed several pressures. By the second half of the season, Cannon should be settling into his new starting position and contributing.