No one is ignoring the second year stats. Mensah is just not a shooter.
http://mccathletics.com/sports/mbkb/2016-17/bios/mensah_souf_9yrv?view=career&pos=sh
He was 2-9 from range this year over 24 games (22%) after going 9-31 last year in 29 games (29%). He just doesn't shoot threes - and in the rare moments when he does, he doesn't often make them. He was also just 50-88 from the line this year (57%), after going 56-117 last year (48%).
Because he's not a shooter, his points must come mostly in the lane. That doesn't help us open up defenses that are already clogging up the inside.
He also has a 1.2 Assist/Turnover ratio (4 ast / 3.2 to) - which aren't great numbers for a pass-first guy against Juco competition. When adjusting for minutes played, he had 5.8 turnovers per 40 min... well above the 3.6 and 3.5 of Sanders and Omoruyi, who had the most for us last year (and above the 4.1 and 4.0 that Bishop Daniels had in 2014-15 and 2015-16)
I'm sure Pikiell and Co. see some potential in him, and I'm looking forward to see how they mold him within their system - but his numbers aren't jumping off the page right now as someone who's going to give meaningful minutes that will be a step up from what we saw last year.