The 5 GK question only matters in this context:
Are you actively developing a cadre of very good young keepers AND giving them a chance to gain valuable experience and playing time?
Or are you simply going with experience?
If memory serves, at one point earlier this season, someone surmised here that Irmo had 5 very good keepers, each of whom could start for most teams in the state.
My experience tells me that, ALL THINGS BEING EQUAL, you go with experience. It also tells me that all things are SELDOM equal.