The way you are using the pronouns "we", "he", "our", and "I" in your text could hint at an underlying personal issue. I.e. you don't like this guy and perhaps feel threatened by him. "we know that", "we are certainly open for suggestions", "we think"... Is that a royal we or do you really know what everyone else in your team thinks? :) Also, unless you own the company, it is not "our codebase", it is "the company's codebase". Also, the answer to your question is to tell the guy to go ahead and commit his suggestions.