If Springer prefers to play DH and is still hobbled by the knee issue, then Bo starting at DH may not be the best decision, even though on paper it's clearly the best option. Springer, outside of Vlad, is the most important bat in the lineup. Need to have him in the best spot for him to succeed.
Let's see where the Jays put Bo when the lineups come out. If he's at DH and Springer is in the OF, then from an offensive upside standpoint, that's the best lineup the Jays could field if Bo can't play the field yet. Have to hope Springer is healthy enough to do that though.