Simply because Sega has only paid for the gamecode and IP rights not rights to any tool used to create the game. This means Sega has the rights to resell Bayonetta any time they want in the future. This is a common practice by all companies, i thought it was common knowledge, but obviously not. And let's say most people's dream comes true and it does become a reality, PG would be involved because they would have to guide Sega on how to utilise their engine.
Most likely, but we don't know if they don't own the engine. Most companies that are funded by a publisher, like SEGA, usually don't keep their engine unless they start it off before they were funded. SEGA started funding them when they were at Capcom.
But it obviously share elements to it. The fact that one button can command a lot of moves in Bayonetta for example was the same thing DMC did.
You do know that a company can just make the button layout like that and not steal another companies engine, right? That would just lead to a lawsuit.
If Capcom really patented that then PG would have had to pay Capcom for doing that. The only thing to get round that is build on a similar or more evolved engine but even that can lead to lawsuits.
You have not proved it uses a DMC engine, just because one 'button' does lots of things does not mean that it uses the engine.
Also engines and IP are two different things as well, PG could do a game exactly like Bayonetta for another publisher but it would be with totally new characters and a new name since Sega owns IP of bayonetta which includes the design character names etc. But tools that was used to create the game, they wouldn't own.
Yes I know that they can make a game just like Bayonetta with a black man and new name. No one said they couldn't.