Tebow was a McDaniels pick. Elway wasn't put in as head of Football Operations until the next year. Tebow's future as a Bronco was essentially dead once that happened, and her performance as QB didn't do anything to change that. Have decided to get rid of Tebow why did he send him to New York, which didn't need a starter, if he was interested in promoting Tebow's chances?
Was there a different team offering the Broncos a better deal? I'm not aware of any that were.
When you trade away a player, you’re not trying to “promote his chances”. You’re trying to get as much as you can for him. Football is a business.
John Elway wasn’t trying to sabotage Tebow’s career. He was trying to make a good deal.