Warren has said she is not running.
Why does anyone think she would run for VP if she turned down her chance for the top spot?
Bernie is not in it to "move" Clinton or "pave the way" for anyone.
He is in it to promote his ideals and win it.

The implication is that if she supports Biden that many of her followers, who wish she'd run, who now support Sanders, would now support Biden.

I know that Sanders is not "paving the way" for anyone. He certainly has earned his place in the race. I just remember when he first entered, especially given his age, it was speculated, that's all.

Unless Biden somehow makes a deal to one term it then boosts Warren into the white house....which would be interesting but I trust the 'maybe this later' very very little.
Even then I don't know if it'll pull a majority of Bernie supporters or the campaigns expansion, and I can't see Joe going after Bernie at all, despite their differences they seem cut from similar cloth that way. I don't think there's any sheepdogging going on at all except perhaps Biden as a spectral back up if Hillary can't muster it.
I also don't know how the promise of 'maybe a Warren veep' would be any different then the net effect a Sanders presidency would have. I'm willing to be she'd be his veep call or at minimum a cabinet appointment.

Warren has come out against the bankruptcy bill that both Hillary Clinton and Biden supported as noted here...

https://www.americarisingpac.org/warren-slams-democrats-like-hillarybiden-supporting-bankruptcy-bill/

Even though she's singling out Clinton more in that article there, I really put more blame on Biden for leading the fight to get that legislation passed, which I think was more to appease "Delaware company" campaign donors as a Delaware senator than it was to work for the rest of us.

If she were to in effect endorse Biden over Hillary and Bernie, I would then be more asking what she's getting out of pushing for Biden becoming president over either of these two, since I think it also breaks consistency with her positions on legislation like the bankruptcy bill in the past too.

I can understand why pragmatically and politically, she, like most other politicians can't really endorse someone like Bernie Sanders now, and would be one like many in the Progressive Caucus, I would expect to en masse endorse Bernie if he were to and once he did win the nomination, when such a move couldn't risk "payback" by both campaign contributors as well as the political establishment if done at that time.

If Biden is even considering it, which is only media speculation at this time.

Even if he is, a meeting with Warren has other reasons. Biden is Pres of the Senate and Warren is a leader.

Okham's razor people. And correlation does not mean causation.