For sure, maybe the Paul brothers are just waiting for Manny to make a comeback and then invite them to a fight. But not sure about the weight though, in any case we will have to see.
I am expecting a catch-weight if this happens

. Manny is to light to fight Paul Brothers, they are in a heavier category which is quite too heavy from Manny's division. If this happens and not a catch-weight fight, this will be very dangerous for Manny.
probably, as Manny's critics will say, he is the king of catchweight during his prime, reign of terror, winning 8 titles in different weight class, I doubt that it can be duplicated.
So yeah, why not fight at a catch weight? not sure who is going to fight him amongst the Paul brothers though. If my memory serves me right, Manny can fight as high as Middleweight, around 158 lbs and that could be the biggest weight that he can go because of his frame. But whatever, if there is a lot of money in the table, for sure there will meet somewhere in the middle to make this fight.