It increases variance of course but you're ahead of alot of hands that would do this. Does him being UTG reduce the hands that he raises preflop with?

18,810 games 0.031 secs 606,774 games/sec

Board: 5c 9h Th
Dead:

equity (%) win (%) tie (%)
Hand 1: 53.0569 % 52.77% 00.29% { QhJh }
Hand 2: 46.9431 % 46.66% 00.29% { JJ+, AhKh }

Would anybody really do this w/o any of these hands? I can't really think of any other hand range to put him on that would do this since all the broadway hearts are gone.