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Labour put in their manifesto to end freedom of movement...
https://labour.org.uk/manifesto/negotiating-brexit/
If they faff about and try to get exemptions the EU won't give to anyone like a single market with no fom it's not going to help.
I still think they may be open to change though and their grass roots activists are busy asking for a people's vote etc.
Mogg only listens his bank account.
JWestland-
Labour put in their manifesto to end freedom of movement...
Not quite. They say: 'Freedom of movement will end when we leave the European Union.'
This is currently a fact--never mind that the EU insist that FOM is a key component of the single market. Labour are not in power and don't currently have to say much about what they would do in the negotiations. At least in this text they don't make any specific policy commitments on FOM. They don't say that Labour will end freedom of movement. Obviously, their target is an end to worker exploitation, but when they talk about fair(er) immigration rules here, they don't say that they definitely want to replace FOM with said rules, but rather that, given the current situation--the UK will leave the EU, the Tories are definitely committed to ending FOM, etc.--, should Labour gain power they would work on the immigration system, as fleshed out by Diane Abbott this week. It's a set of subtle differences but cleverly worded to allow Labour flexibility, perhaps, as you say, to react to grassroots pressure, but mostly, I think, not to be drawn into a situation in which the Tories can build up 'Brexit' as a major difference. As in the last general election, Labour want to define that difference through all the other parts of their (popular) manifesto.
Oliver Schick
I don't think these are Corbyn's policy goals at all. Labour has clearly committed to a customs union. Their stances on the single market and freedom of movement are far from clear. Have they said anything about them? I certainly don't believe that they want to throw the baby out with the bathwater like the Moggies. Where I agree with you is that I think it may be possible that he may want to use the Tory mess as a cover for renegotiation. I don't think that would work with the EU, though.
So far the only line I've seen from Labour is that they want to guarantee EU citizens' rights, preserve EU institutions plus ECHR, have a customs union, and otherwise leave their options open.
As I said, I don't think the ERG types would eventually vote against May. They're far more worried about a Corbyn government. They'll keep their unity and wait for the moved goalposts.