I suggest you create a new account as well (but contact support first to confirm my info), since who knows there will be more multiplier contest on BK8.
Yes he should and he can use it for the upcoming slot contest, I believe he does not want to miss the contest as he is a regular participant in almost all casinos.
Yes, the newest Slot competition is on the way with some new rules.
Sports competition is still on review, Slot games are the main focus at the moment
This week or next week for the new competition? Only multiplier competition or also buy bonus contest? I think buy bonus contest will be fund since we can play cheap buy bonus but unfortunately the number of providers with buy bonus feature is not that much in bk8.