I think my expectations for what Ben will accomplish in the portal are so low that I'd be happy with a former top-150ish recruit who struggled for playing time at a top 25ish school. Especially knowing quite a bit about his game as I've seen him play many times.
I'd take a cast off from a P6 top-25 tournament team over, lets say, some kids from low major schools or Payne's brothers from UWRF (or wherever he is) or many of the other "gets" from the BenJo era so far. At least King (and anyone like him Ben could target) have shown the potential as a high schooler to be a productive P6 player.
Do I think King is all-B1G? No. But I think he'd be better than at least 1 of, if not multiple of, the guys Ben will fill out his roster with (assuming he fills out a roster this year--we know he doesnt like doing that). If it came down to Ramberg or King--you'd be happy with Ramberg? Not a chance.
Let's try to remember the likely choice here: it's not between Eli King and another walk-on. Also, we don't even know if Eli King wants come here.
When you're recruiting from the transfer portal, normally the choice is based on what those players have done in college (of course, they also have to be willing to come here). The history of college basketball is loaded with players who looked great in high school but were mediocre or worse in college.
Also try to remember that not all of the players recruited by this coach were the caliber of Charlie Daniels, Danny Ogele, and Taurus Samuels. One certainly can argue that Johnson has made more recruiting mistakes than most successful coaches but I would imagine that even John Calipari has made more than a few in his career.