The issue is viewing this as if Cal is still coaching. The downfall was never because he recruited 5 star 1 and done type players. The issue is that Cal fostered a culture of being 1 and done as the ultimate goal. On top of that, he tried to fill his roster with those types to the point that everybody that came to UK under Cal expected to leave after 1 year, even if they weren't really ready.
The best roster building is going to be exactly what Pope has described numerous times. Get a few freshmen, some star 1 and dones, some multi year players, back fill with a few portal players, and the remaining players are returning players. Dan Hurley has said the same thing. Portal guys are proven, but have are limited on what they can do. If they weren't limited, they wouldn't still be in college.
Right now, if everybody returns that has eligibility left, you are looking at 5 returning players. Under Pope, I would expect at least 3, and possibly all 5 return. That gives a great nucleus for next year. Add in 3-4 freshmen, maybe 2 studs that may only stay 1 year, and 3-4 portal guys, with maybe one of those guys having multiple years remaining. Riley would add a 6th guy that could return, and if he doesn't, then it is likely that he played well enough that he significantly added to the team's success.
And one last thing, it is hard to build a complete team from the portal every year and be competitive, because the portal guys are generally the most expensive when it comes to NIL dollars.