Wims is not a lock to make the team. But its tough to envision a roster without him on it. Right now I'd have him penciled in for that 4th WR spot that was assigned to Bellamy last year.
As for the roster, there's some flexibility with the offensive skill positions: WR, TE, HB, and FB. Having only 2 QBs also helps.
i think the Bears will keep 7 wideouts unless the rookie Whyte beats out Cordarrelle Patterson for the KR job. If not Whyte can be placed on the practice squad or come up with a season ending injury and stashed on IR.
The last WR spot could probably go to one of the Halls. Marvin Hall has 2 years of experience and 12 career receptions. The undrafted rookie Emmanuel Hall was passed over by every team in 7 rounds. So let's not overvalue these 2 guys.
And of course there's injuries so its good to have an abundance of talent.