I still maintain that Kira can use it. It is his stand, and he displays the ability to do so. Hayato being alive is proof that he can use it himself.
The fact that hayato is alive is proof that the first time he uses it it only rewinds time.
The fact Hayato is alive is proof that Kira can actually use BTD without placing it on another person.
Why hasn't he used it before? He could have solved it much easier. Then the last scene of bites the dust is clear: he could only use it after being in contact with a non-stand user
It's simple. If someone who already knows, tells someone else, BTD won't activate. If Hayato told Josuke, then nothing would happen to Josuke, because Hayato already knew, and wouldn't be implanted with BTD. The same for how Josuke didn't explode when he figured out Kira was Kira, because it was Kira who had given that away. Hayato couldn't die, but he couldn't tell. Hayato was already dead, and so the stand arrow gave him an ability which ensured that time rewound, protected Hayato from dying, and kept him from talking. He can use it on himself and on non-stand users. This is because it is HIS OWN STAND, and he can lend it to people without one. This is the reason why he had to undo BTD when Josuke was attacking him. He needed to get hi stand back from Hayato. BTD is literally Killer Queen. It's not another stand or a separation like Sheer Heart Attack. It is Killer Queen. Kira can use it himself, because it is his OWN stand ability.
If someone knows, and tells someone else, BTD won't activate ... No? Absolutely not? Hayato knew about Kira but if he said it everyone died.
Then everything is denied with hayato who became a guest of bites the dust, when he already KNEW about Kira Yoshikage.
Bites the dust will also be his stand, but it is activated only by planting it on a no-stand person.
No. If you tell someone who already knows, then that person won't blow up. I dunno where you got that other idea from. The whole idea is that Hayato knew and needed to be shut up without being killed. But BTD won't kill someone who already knows that Kira is Kira. If Josuke already knew about Kira, and Hayato told him, then BTD wouldn't activate on Josuke to kill him, because Josuke already knew.
Kira would absolutely body him
I'd like to think so, but likely nothing would happen. It would stalemate, because Kira would end up in the past or something due to BTD.
Probably some sort of paradox, since they're both time-related stands. One skips time, and one rewinds it. So essentially, Crimson skips the rewind, but it still happens, since the effects still occur even when the cause is erased. So Kira will end up somewhere else at a different time like nothing happened. BTD still happens, but nobody explodes. Battle just ends. KC and KQ can't fight because their greatest abilities don't effect each other well.