However good he might be eventually , there is a decent chance that Harper is ass his first 1-2 seasons. Not just neutral, but actually a bad player impact-wise.
The guy I hear him get comp'd to the most is Cade Cunningham. The guy I see the most in him is actually Fox. It's important to note that while both guys eventually became all-stars, both were terrible their first season (Fox epically bad) and Cade was pretty bad impact-wise up until this year. Harper's got a lot of the same strengths and weaknesses as Fox coming out - gets the the basket well, poor jumper, more combo guard than pure point. Harden came out of the gates a positive player but also finished his sop re year before coming out.
All this to say, I hope that Harper roars out the gates and becomes a positive player right away. But in the more likely scenario that he sucks (ok counting stats, inefficient, lots of mistakes, bad impact) his first 1-2 seasons, hopefully we won't see a ton of cliff jumping. That doesn't come for me unless he continues to suck into season 3-4.