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Biyombo's a few years younger than Jimmer, has elite size and athleticism to play C in the NBA (something Jimmer does not have at any position), plays defense infinitely better defense than Jimmer, and offense is the least of our concerns up front. Does Jimmer blow Biyombo away offensively? I suppose so but I'm not sold on that translating against elite athletes night in and night out. The flip side is Biyombo could become much better on offense given his age, athleticism and work ethic. Could Jimmer's defense get better? Perhaps but I wouldn't lay money on any sort of substantial growth.
Just my opinion.