He might just be a little bossy as well
but if hes lived a long time not knowing when his next bit of food will be, the last thing he wants is some other cat eating it. It takes time, but depending how long hes lived like that, he might always be greedy with food although his aggression to get it may well ease
oh dear
if so i dont know how she could stand by and leave him like that
All the same i'd register him found - it could be hard to tell how long hes lived on his witts so its knowing how far back to go and register with the rescues, local/surrounding area vets etc. You can always say you made every effort then
I just know how awful it is when they go missing
But either way, to me you have a good little fella. Mouse will take a while but if you have that spare bedroom i'd use it to keep him in. He builds his health (realises his food wont run out) Mouse has the run of her own space and introduce slowly....oh and once healthy get his peas podded
that'll make for a less aggressive cat too
But if you really think that Mouse isnt going to handle all this then the decision is up to you of what to do. You saved his life regardless and he is going to get the home he deserves, whether its with you or someone else
For all my grumpy mans tantrums, if i thought getting my others would completely effect his or the other cats welfare then i would not have completed it. As it is he likes bossing the younger ones about as it suits his grumpy nature quite nicely