Timing belt doesn't require a cherry picker. While the conclusion was the same, yours was incomplete. With your solution you woud have had to wait until another day to research and then had to go back and order a timing belt. I do see where he is coming from...a cherry picker is not needed to do analysis and while your possibilities froze you in your tracks he saw that it's possible we may not need one. In this situation this is the case, but what if you had a timing belt and changed it right then and could change it right then and there. Or was an easy fix. You would have pushed off what could have been fixed because of unknowns. As a Ti if I didn't have time and there were other pressing issues, I woud have agreed due to the time it takes to analyze. If I had nothing else to do its more efficient to use the time then to wait until later. Completely depends on whole situation as to the outcome.