That is a good season for Davis, but no way would I take him ahead of the other bigs you mention. Still, he may be a late first rounder in draft leagues now.
Not sure I'd compare Holiday to Harper. Actually I assumed you meant Derek, which doesn't make sense because Jrue didn't pass enough to warrant comparison there, but he's virtually interchangeable with Ron Harper. Slightly better efg%. I don't see him going higher than the 4th round but I am wrong all the time.
Agree on Drummond and Jokic. I don't get the Gibson-Ibaka comparison, mainly because the difference in D rating is substantial.
And yes, that's a lovely Capela season. I don't see third round, but definitely fifth and occasionally fourth. His better-than-mediocre D rating probably makes him the favorite half-time board lord not named Whiteside.
The Horford season looks good at SF. I wouldn't play him at PF or C.