I believe that could be from Jesse's confession tape, as they have must definitely searched their hideout after that little massacre.
Hank managed to kill Tuco and the Cousins. If Hank was notified of Lalo's intention of killing him, then I think Hank has a pretty good chance.
@MonsterZeroIsMyFave It's been confirmed that it isn't Lalo. And even if it was, it still wouldn't make sense as Lalo is older than Tuco, as has been stated above.
Watch the scene again. He did try to run but he was too late.
Could you share the source where their age has been revealed?
Saul has more screentime in the entirety of the universe so I would say Saul.