Every MEC is in bed with mgmt. It is a fact of life or necessity. You cannot have a relationship when it is constantly hostile.
Look back at your individual MEC's and you will see those policies, LOA's, grievances, other items that while not blessed by the MEC allowed by the MEC. I think the term is "reasonableness", something I heard uttered from SE more than once.
So, is he in bed with Mgmt? probably not as much as some wish, but surely he has spent time in bed with them. So did the previous chair and about every chair of every MEC on every ALPA property. Otherwise, nothing would get done. That does not mean he is not behind the pilots.
SE is into his second year, his legacy will be based on his accomplishments and failures. What most pilots look at is not the accomplishments of years of service, but of the NOW or what happened yesterday.