Why the problems with the rabbis, priests and levites?

If we accept that Bar Cochba restored the sovereignty of the land of Israel, why do the gospels present him (in the character of "Jesus") as being in conflict with rabbis, chief priests and Levites?

If he restored the sovereignty of the land of Israel, he should have been hailed as a hero.  Yet instead he is castigated as a "false prophet."  Why?

In order to effect the reinstitution of the sovereignty of Israel, bar Cochba had to find a means of creating continuity with Judean history/tradition in a way that did not mandate Temple praxis--not only was the Temple destroyed, but Hadrian had dedicated the reconstructed temple to Jupiter.

Bar Cochba advocated a return to the Israel of pre-Davidic covenant (Jebusite cult/Judean Temple worship).  Cohenim/Levi'im objected because a return to pre-Davidic israel would obviate their patrimony/social status.

The rabbis, who were rising as a professional and social class in the aftermath of the destruction of the Temple.  Their function was the conservation, preservation and transmission of Judean history/culture/law.  They objected because returning Israel to the pre-davidic era would mean eliding from the text the laws concerning Temple praxis, and would mean effectively delaring that Judean history/culture/praxis from David-present was an error.

Thus while it would be expected that Judeans should celebrate the reinstitution of the sovereignty of Isreal, in reality that very reinstitution presented problems regarding social/legal/historical continuity.

It is possible, it is likely, that bar Cochba intended to retake the Temple, and reinstitute Temple praxis.  But at the time of his reinstitution of the sovereignty of the land of Israel, the Temple had been rededicated to Jupiter to Hadrian, so any worship praxis engaged in by those in the reinstituted land had to be praxis that did not include the Temple.