I have pulled in 6 man classes a couple times. No big deal even if you lose a few dice rolls. Were they all studs day one? Nope. Did they develop into great players? Heck yeah.
Just had six openings with my Southern Mississippi team (5 graduations, one EE). Lost out on 3-4 players I spent money on, filled 5 positions, and would have filled the sixth if I didn't spend my scouting money frivolously and get called away from a couple cycles to handle a family emergency. Three of the newcomers are starting and we are in the hunt for an NT berth.
In my first full recruiting at Baylor I pulled in 5 recruits that took me to the PIT in year one and the NT in year two in a power conference.
I am not great at this game yet and freely admit I still need to learn more. However, I can say that large high quality classes are not impossible or overly difficult.