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If they keep the current roster, and when/if Tui is in the bigs, then I think they envision Lopez at 1b a fair amount, with Tui at 2b, giving them a more RH look. I think they will be selective about playing Kotchman vs. LHP.
MB will play LF only part of the time. Some that time can go to Figgins in LF, Tui at 3b.
Or when MB and Jr. both have a day off, Tui would be RH DH.
I certainly see enough possibilities to give him a chance to see what he can do.
But G is right that "third-stage" 26-year-old Tui, if he comes, will not come until after the roster squeeze.