Regarding Tsukune's powers, while I agree that using them might be dangerous, at this point I also have no doubt that he has to somehow take that power under his control, without letting it corrupt him too much...
After all, that's precisely the reason why he has been training so much...
The reason why I think so, is because it's not like the blood within him can be permanently sealed, since like it was shown in Moka's case, even the most complicated seal can be broken.
And if you think about it, do you think that Inner Moka would forgive herself, if Tsukune has been corrupted by the blood she has given him, and isn’t the Tsukune she knows anymore, since personally I doubt that - although I'm quite sure that she won't mind if he continues having the attitude he had in the current chapter
He's just going to need to learn to walk a middle path between his previous human mentality, and the destructive instincts of his Shinso blood, and I believe that Moka and the other girls are going to do everything they can to help him in that task.
Although I still wonder what exactly the other vampires are going to think about Tsukune, since I doubt they would be happy to learn that there exists another being that is similar to Alucard, and has probably got a similar power level as him - well rationally speaking Tsukune still should be weaker then Alucard, since he hasn't absorbed any ayashi within him - although Tsukune's advantage is that he still hasn't lost his sanity.