I see a few people shooting down this idea (i.e., Cumbest batting first in the order). I can see the value in having your best hitter bat first in the order, so I'll make a few points in support of it.
Cumbest would only be a "lead off" batter in the first inning. Subsequently, anyone in the batting order could be leading off an inning. Hopefully, there will be runners on base whenever Cumbest bats after the first inning.
By batting first in the order, Cumbest would be guaranteed to get the most plate appearances in the game, which is something you would want for the best hitter.
At this point in the season, there's no harm in trying it. Go ahead and bat Cumbest first in the order and see what effect it has on the rest of the batting order. See how the games play out with Cumbest batting first. We won't really know unless we try it.