Supporting the minority in the FI, as opposed to the majority, has /nothing/ to do with whether one supports the right to tendency and caucuses. The minority supports this as well. What I think is a better approximation of the division is whether we support /liquidating/ the historic program of Trotskyism in order to build these big centrist formations or not.
Do we build revolutionary Marxist currrents inside these parties or just become part of the undifferentiated mass? That's an important question. The method of the FI majority seems to lean towards making the building of broad electoralist parties the policy of the FI.
Read the proposed document for the World Congress - /Role and Tasks of the FI./ It advocates the building of all-inclusive parties. Look, I agree with you that the NPA is an important development, but the LCR liquidated itself with no perspective of building an internal tendency, no balance sheet draw by the members on the LCR experience and no way for comrades to connect with the FI except as individuals.
This, IMO, is an error and an attempt at a "get rich quick" scheme.