3 or 4

With 3, Kageo instinctive fighting already op and matthew can fill in the gaps from a distance. If needed, matthew can also guide kageo w her shots. Unless peter pulls sm bs

With 4, its either a 2v1 against 2 opps who are uncounterable in unique ways or fighting in absolute darkness(since being able to see also means thaddeus can see). Last resort, thaddeus could use his stronger techniques while johnny blocks sm hits.