For me, I want him to hit whichever way he can to get on base the most. If he had a slash line of .300/.380/.370, I'd be quite happy. Pierre had an ISO of .062 in the minors and a .067 in the bigs. BH's is .103, mostly because of his 3B's (he has 14 in 152 games, Pierre had 12 in 317 games).
I guess the question is:
Do you anticipate him having enough power for it to be worth him possibly not getting on base as much?
My answer is no, I just want him to get on base.
If you think he will have a bit more power, which it seems you do, then I completely understand your point.