I think we realize the likelihood that it's LaChance at RT who's gonna be left off the starting 5.
I'm assuming LaChance has to see this too. Not only do the coaches want all their tackles cross-trained, but the staff surely doesn't want the pressure of having Kingley in the mix — being felt by any one guy. Particularly a guy as talented & experienced as LaChance.
Regardless, we're sure to have a 3-man rotation at tackle. I know all three men are thoroughly cross-trained (w Freeland having started at RT).