I offered him the chance to, because (IMO due largely to my own fault) we didn't have enough bowling-based players on CricSim. Particularly newer, active ones. I also offered the chance for Martyn and Wood to drop their batting and go from bowling allrounders to bowlers; an option which Martyn took up and Wood did not.
When I joined, there was the notice on the registration discouraging further bowling signups. At the season's end, Cribb offered me to change player type down to bowling all rounder because he felt his influence may have affect my decision (and someone else's). Obviously, I opted to accept.