Why Michael Tannock was removed from BM team? Or he’s still here with us? 
“Michael Tannock: I’ve actually been removed from the team today.”
It’s that true? If so…
if it is true then they will have good internal reasons.
Who can tell? MT’s name is now featured amongst the past developpers’ on the list.
As has been said, it would have been for good reasons, none of which would be discussed in a public forum. There are many other developers who have left the team over the years.