[Chris38]

Spoiler for Tsukune''s blood:

Well I would have to agree with Kenji here on the matter, that the power of Tsukune's blood have remained inactive for a large period of time, since if that wasn't the case Tsukune would probably transform into his current form, a lot sooner...

Still, I wouldn't consider the fact that Tsukune's blood was remaining dormant within Tsukune's body a plot hole, since it has been already mentioned that the Holy Lock is an item that prevents Tsukune from fully degenerating into a Ghoul... and that it was implied that the Shinso blood needs some kind of "trigger", for it to be able to fully awaken...

After all, it's not like Tsukune has gained control over his powers yet, and if he does, it probably is going to be explained on how Tsukune managed to do that, but since the story hasn't reached that point yet, it's still too early to consider it as a plot hole.

@Shinso Tsukune

Spoiler for Tsukune's form:

Well, the only problem with Tsukune receiving a seal similar to Moka's, is that if something like that occurs, Tsukune's personality would need to be sealed as well - after all to seal the power of a Shinso the Shinso's personality would need to be sealed as well, and I think we already have enough characters with multiple personalities already.

Of course Tsukune could receive a different kind of seal to hide his ayashi attributes, but the problem would be , that the seal would probably be too weak to entirely hide Tsukune's ayashi powers, which could be a problem, so it's probably a good idea to wait and see how Ikeda is going to resolve this matter...