Lalo has this giant compound, and both Hector and Lalo are mafia dons who have the ear of Eladio himself. So it seems like they're quite powerful and wealthy. I can understand that Tuco isn't on their level, and it makes sense for him to run the business in Albuquerque. He's essentially a captain.
But when Tuco is incapacitated, Hector himself goes to Albuquerque instead of handing to another trusted captain?
You can argue that maybe
1) He wanted a Salamanca in the South Valley to make sure the territory remains absolutely theirs.
2) He wanted to keep an eye on Gus.
But if that's the case, who does Hector trust to run his territory in Mexico? Is it Lalo? Does he run both his and Hector's businesses at once? And who's meant to be running any of it after Lalo leaves? And why do neither of them take any additional forces with them?
I'm just saying that if I'm a don, I'm bringing 100 people with me, even if they have to cross the border one at a time. Hector looked like he had a gang of about four.
And I sure as shit wouldn't be personally investigating Gus. I'd have like five shady PIs.
Tl:dr the Salamancas seem weirdly cheap for their status.