Fair to say if Hayward asked Ainge to move Crowder. I'd be surprised if there is one person that wouldn't get rid of him real quick to acquire Hayward.
It is possible but Hayward is a better caliber player than Crowder, and I doubt he feels threatened by him. I think the board here values him more than the NBA as a whole but this is often the case.
Interesting you say that, because I feel the total opposite.
In last year's ranking of most valuable trading assets in the whole NBA Jae Crowder ranked #32, that's including every all star and rookies on bargain contracts. I saw a site that was speculating for possible trades the Celtics could make to win a championship and which trading pieces they could use and named 3 players as untouchable namely Thomas, Crowder and Horford.
Wasn't Chicago insisting on including Crowder into a deal for Butler? Apparently he was a breaking point and not an extra first rounder. If the Knicks informed for any interest in a trade for Carmelo Anthony I'm pretty sure that Crowder was on the top of their list too.
He's widely regarded as one of the best contracts in the league. Also a key member of a NBA Conference finalist. Just came short of being included in the NBA All-Defensive 2nd team last season (had similar votes as Paul George and Klay Thompson). Besides being seen as an elite defender he also improved offensively by increasing his 3P% to 40%.
In short Jae Crowder is very marketable.