Should I re-roll my giveaway again in this situation?

I have a private giveaway which has 5 entries and was just re-rolled because I found that the first chosen winner already owns the game. But the second chosen winner's account seems not quite right either.

These are my doubts:

1. There are very few games (13 games) in his account, most of the games are from indie bundles.
2. My giveaway was created 5 days ago and ended 1 day ago, but his last steam online time is 8 days ago and I've been waiting him for 1 day but he still hasn't shown up. But his last SteamGifts online time is 3 hours ago. I know he lives in the same country as mine (because the giveaway is private and only open for players in my country) so there should be no time zone difference between us.
3. His steam account was created since December 24, 2011. He does not provide any information on his steam profile, and no one has commented on his profile. His steam rating is 0, and 0 hour of play time in the past 2 weeks. Only 3 of the 13 games have play records, and the total play time of all of the 3 games are only about 2.5 hours (1.9 + 0.4 + 0.2).
4. He has 4 steam friends, one of them is the first chosen winner I mentioned at first which already owns the game but still entered my giveaway.
5. He has joined 3 groups, one is the holiday sale group, the other two are well known giveaway groups and I think he joined the groups just to enter giveaways.

All of the information on his profile makes me think his account is a sub account only for entering and winning giveaways. And if that's true, I'm not pleased to give my gift to such a person.

So, should I, or can I ask for re-rolling the giveaway again?

Thanks.

EDIT: I've contacted support so I'll leave it for support to decide. Thanks everyone. Thread closed.