I still dont get it !UBS is the advisor to mos.It now holds...

I still dont get it !
UBS is the advisor to mos.
It now holds 7.49% and it has the voting power to influence the outcome.
Is this irregular ?
Is it a conflict of interest ?
Is it in the best interests of mos S/holders that UBS is doing this?
Is the advisor in this instance buying up shares in order to assist the mos Board in getting the deal over the line?
Does the advisor earn a success fee if the deal goes through?
You would think that they must be acting for the Board in buying the shares. Otherwise their position as advisor would be untenable.
Does anyone have any ideas about what might be going on here ?

Thanks