Keeper league.. first pick

Typically we need to declare keepers before the draft lottery but this year has been… different.

10 Team Full PPR…
1QB, 2RB, 2WR, 1TE, 1FLX(RB,WR,TE), DST, K

I’m choosing between Jacobs, Mixon, and Lamar… I was leaning Jacobs and Mixon but with the first pick now Im guaranteed to lock in CEH… Do I keep Jacobs and Lamar adding CEH? Or do I just keep Mixon, Jacobs and start the Draft with a 3rd RB?

For the record this is only a question because I don’t believe in Mixon at all… after buying into the consensus hype since his rookie season… Im over it.