Anon opinion, Justin Amash is a cabal sleeper cell. The strategy is to get their puppets in under the R banner, prop them up, let them vote conservatively for cover, then they activate them as needed for crucial votes, and other high gain situations.
The fact that they activated him now and in this way is telling. Feels like they must have lost leverage on their other sleeper cells…strings cut. And this activation won't have any meaningful legislative effect other than making the media salivate.
So why activate him now and on this? When you are winning, you don't deploy your secret weapons…they are too valuable, so you keep them secret.
Conclusion:
Desperation. Their sleeper cell ranks are thin. They are losing and they know it. Hail Mary.
Just one anon's opinion. No sauce, only a hunch.