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ST results hitting-wise can be incredibly misleading.
That said, I'd support Tui over Josh Wilson if Hannahan goes down although I prefer Tui having a little more time in AAA.
Tui as the supersub infielder that can back up all positions and get regular PT is absolutely okay for me. It give you a TON of options day-to-day and kills the need for a backup infielder.
Jack Wilson needs rest or the offense is struggling? Tui goes in at SS.
Figgins can get extra rest for his hammies against tough lefties (hes better vs righties).
Ackley can get subbed vs a tough LH pitcher as well.
Tui could even sub for the 1B.