There was the breifest of moments before kimball and wash showed up during carolina's heart felt talk with him where he was actually going to lay down his arms, you could see it in the facial expression, but after seeing wash and kimball, he continued on.
So there was so much potential. A lot more then felix had in a way.
However, the possibility of learning about felix and locus' time during the great war together, could also open up potential for felix to and make him more relatable by learning why he did what he did and all, especially to locus, his supposed brother in arm.
And to also learn if they were bounty hunters before the war or after, if after, what happened to siris as well as what hapened between that time that further turned felix to the dark side. Was it just the money or something more? Why he started fearing locus and so on and so forth.
Theres just so much they could do.