My top 4 are Warren/ Booker/ Harris with Klobuchar being a distant 3rd. I think Warren will end up with the nomination
I also fear that Warren will end up with the nomination. She is way too far left for me, and she is fond of playing identity politics. But she is in a separate lane from Biden and other moderates.
I think you may be underestimating Klobuchar, esp. if the moderate lane opens up. A lot of the moderates dropped out (Hicknlooper) or failed to make the next debate (Bennett, Bullock). Buttigieg could also contest the moderate lane and he is not even on your list.
I think Kamala Harris played her race exactly wrong. Her background as prosecutor lent itself to a run in the moderate lane. But she saw Biden hogging that lane and saw him as an insurmountable obstacle. Had she bided (no pun intended) her time, she could have used her relative youth to contrast herself against Biden whose age is becoming more and more apparent as the race drags on.
She could have also appealed at her ancestry - Jamaican father, Indian mother, and family - white husband - as a vehicle to show unity in diversity.
Instead, she decided to cast herself as the "great black hope" by attacking Biden on race by renewing a debate on busing from the 70s. It seemed to work initially but then people remembered why the busing was so unpopular in its heyday and why it ultimately failed, and also saw her attacks on Biden as unfair, and her numbers started to slip.
In addition to that, her casting herself as some sort of race warrior (remember, she - as well as Warren - called the justified shooting of Michael Brown "murder") opened her flank to the attack by Gabbard on her record as a prosecutor and AG, which was much criticized for years by the more "woke" parts of the black community, first and foremost the "Black Lives Matter" types.
While I think Harris could come back if Biden falters by being more her authentic self, the almost fatal wounds to her campaign have been self-inflicted.
Biden is showing his age badly. Warren is also older than ideal but she seems to be holding up much better than Sanders, Biden or d-Trump.
She is also significantly younger than them.