They won't deprive mother from anything and its actually better to have 1-2 pups connected to the motherplant as they share nutrients and energy produced plus the mat then has double the transpiration of just a single motherplant growing and produce more roots,decreasing the chance of root rot from the mix staying too wet for too long as they will be drying it faster. A mat is also more difficult to rot whole so you have better chances of being able to salvage something if you grow if problems arise. Plus,when the motherplant does eventually fruit,the pups will help the bananas mature if something happens to the motherplant's leafs and when it finishes ripening them,you have a ready and big follower ready which will make use of all the stored energy and nutrients in the motherplant and grow and fruit super fast compared to it! So leaving 1-2 pups is a win-win situation,it just requires you to keep them in a pot big enough to accommodate all corms and have a little room to spare.
All that said however,your banana is too small to pup normally and pups at this small age would result at plants of about the same size all eventually flowering together which isn't ideal for your situation. So I would remove the vigorously growing pups now or,if you want to keep them or give them away,once they have a decent but not too big corm,and keep it pup free till its 1-1,5m tall and then let the deepest growing pup that will be produced grow and become the follower. Latter,when that pup becomes 1-1,5m tall,you can leave one of the pups it produces and that will give you a nice,manageable mat of 3 plants that will fruit successively with not too much time between them.
Happy growing! Indoor banana growing certainly is more challenging than outdoors in a warm place!
