No one has shown that collapse would not initiate in the NIST scenario given the addition of the side plates or any other structural element omitted by NIST. Hulsey and Arup specifically tested alternative scenarios and found, in those alternative scenarios, there would be side plate trapping (and I'm being generous by characterizing Hulsey's conclusions to date as actual findings, given that his approach to local connection failures seemingly makes little sense). (Arup also found that in several of those alternative scenarios, the girder still failed after the side plate trapping.) But no one--not you, not Hulsey, not Arup, not Weidlinger--has recreated NIST's comprehensive model of the first 16 floors of WTC7 and tested, as NIST did, how the observed fires--acting in an actual progression scenario--would damage those floors. Reducing the problem to merely being whether the girder moves against the side plate at a certain point in time under a specific set of conditions does nothing to undermine NIST's report unless you show that also happens under NIST's scenario, taking into account the fire progression and the damage in the surrounding area.