Well I guess Acevedo has to swim at some point. Seems like a relatively weak lineup, I don't see anyone other than Mastromatteo even having a chance of swimming the finals should Canada qualify.
My speculation is that they are going MMFF, which is the best order, and that the finals lineup should they get there will be Liendo, Mastromatteo, MacNeal and Oleksiak.
I guess K. Smith will swim breaststroke in the women's medley heats (otherwise all women's relays get DQed).
Edit: Thormeyer, not Liendo. Not sure why I thought Liendo won trials in the 100m back...