I'd go with either Mixon or Singletary. Pascal probably has the higher ceiling, but lower floor due to Lattimore.
Both RBs have bad matchups, but Singletary gets receptions. So is safer between the two. Depends on how safe the rest of your roster is and how much risk you're willing to accept.
If I had zero belief that Luck was not coming back in 2020, and I don’t feel like he will, I would be willing to give up some capital to get Burrow. Tua scares me as a huge risk-reward kind of kid. Love not being from a big college or having huge competition concerns me as well. Why did he chose that college? Don’t really know a great deal about him though. Guess we shall see