Perhaps the language of the press releases from SWR and the RMT suggests the RMT wanted the strike suspended this week. Some unlucky guards may have lost four days of pay in the last month and see the cost on payday. SWR have increased some services on strike days, which is only possible with more guards available.
In fairness to the RMT things are looking awkward now, as everyone involved knows they have no more time after these strikes before having a third ballot. There must be a significant chance it would not renew the mandate given how slim it was last time. If that happened, there is precious little negotiating time left until they are spent and drop out of the discussion.
The SWR offer on guards is far better than Merseyrail or Northern’s already, and with some negotiated tweaks it could easily keep some significant power in the RMT’s influence, which is what this is all about. Whether those options are still available to be negotiated or not remains to be seen.