Are you guys taking Krivas this year or last year's Kalkbrenner? I thought Kalkbrenner should have been a late first last year and it looks like Krivas is trending toward being a late first rounder this year.
Contrasting the two, I would say that even though they are around the same size (7'1-7'2, 7'5-7'6 wingspan), Kalk was a much worse rebounder and this same weakness has translated so far in the league. He was also a much worse FT shooter and he has virtually no hope of converting to a stretch center whereas Krivas does.
However, Kalk was able to protect the rim without fouling (less than half the foul rate) which is a big deal with regards to winning the possession battle and was an absolute elite finisher around the rim (>75% around the rim with high volume dunks over all 5 years of his career). In contrast, Krivas has a significantly lower (1/3 the volume) of dunks and his rim finishing percentages are actually very poor for someone of his size.