That poll of polls is trash. Warren is still at 18% when she hasn't reached that number in any of their last 7 polls lmao. They are still weigthing her October numbers it seems?
The RCP poll also accurately showed Bernie's post heartattack downturn and consecuent uptick.
Anyway national averages are irrelevant right now. What matters is Iowa, NH and Nevada. In such a tight race, who wins those 3 states will be the tie-breaker.
None of those states will matter if Biden keeps his current support among black voters, which sees no evidence of dropping. I somehow doubt the people behind Biden are going to be convinced to vote for Bernie if he beats Biden by 3% in New Hampshire, Iowa, and Nevada.