Wouldn't grad transfer coming in for 1 year create the same concerns?
It's different because not many grad transfers are 5-star quality kids, the age difference is a positive factor where transfers are early twenties vs. late teens, and they probably have only a fraction of the hype and expectations that a one-and-done.
The one-and-done 5-star kid would present a new kind of challenge (note that I didn't say problem) to the existing culture and established upperclassmen. At some point, with the right kid, I don't see Collins hesitating to recruit him, but even if our program was elevated to a blue chip level program, I don't see us being able to go the one-and-done route on a frequent basis.