Board Thread:General Discussion/@comment-27422022-20150101233748/@comment-26040598-20150101234530

It does seem like they team up when absolutely necessary. They were fierce rivals when they met in SA2, and Shadow only helped because Amy convinced him and also for Maria. And Shadow and Team Dark helped in Heroes because it was necessary to stop Metal and they had a emerald. So you got a valid point based on what's happened in the games.