The Houston Chronicle (Jonathan Feigen) reports: Dikembe Mutombo said Thursday he would instruct agent David Falk to negotiate with the Rockets on a contract for another year. Having Mutombo back for an 18th NBA season would not seem to be progress on change. It would be. Mutombo, at this stage of his career, is insurance. His return would allow the Rockets to spend their summer allowance on the perimeter, rather than on a Mutombo successor. Big men are expensive. The Rockets did not want to empty the mid-level bank account on a guy that - again, assuming the Yao-McGrady foundation to be sound - would only play 12 to 14 minutes a game at most behind Yao.