Lumpkin was a starter and played starter minutes and should not be compared to a bench player. Skelly has more than adequately replaced him and his shooting has improved. Lumpkin's numbers declined significantly in conference play or quality competition who had NU scouted. Let's not over-inflate his offensive contribution. Yes, defensively he was excellent but offensively, he was an issue.
Brown at 6'0" is a tough matchup against 6'3", 205 lbs. muscular guards in Foster and Thomas. The bottom line is their four-star guys off the bench - Ballock (6'5", 205 lbs. who NU recruited) and Ty-Shon Alexander from Oak Hill Academy (6'4") went 8-14 FG, 4-7 3 PT FG, and 20 pts. They lit us up particularly in the first half and our four-star players (Falzon and Rap) did not play and our high 3-star player Anthony Gaines scored 1 pt.
In order for the bench players to contribute, they need to play more minutes. Benson showed flashes and needs more minutes and Gaines will get more confidence as he plays more. Benson has to play more as NU's only other big or NU will continue to be abused on the boards by MSU, PU, Minnesota, Iowa, UW, etc.