Spence will be a favorite if he will face pacman but it should not be a heavy favorite as people already saw how spence is vulnerable of losing.
I dont think theres a heavy favor on both sides as well as huge betting odds. The only threat I see as Pacquiao's opponent is Terrence Crawford.
That isn't a problem if Spence win over Porter so he can fight Pacquiao. He must do his best in order to beat Porter and have a match on Manny, and most probably he'd be the next to be added of Pacman's collection of knock out buddies.
No man, Manny is too old to get a knockout. But if this fight progress and happen next year, then we may probably see a vintage Manny going to to toe against his opponent. But if the fight will not happen next year, it would be better for Manny to hang his gloves because I think he can't coup up with the young boxers after 2020.
Agreed, Pacquiao lost his killer instinct as he aged, "BUT" never get to comfortable with it, because the probability of getting knocked out is always there, though it has been reduced a large chunk of percentage.
I might give Pacquiao 2 more fights before he hang his gloves, because the man actually still wants to fight. But with a Marquez-like K.O will surely give him an exclamation point.