The strongest Boo-era earthlings(ie. Krillin and Tien) could have probably beaten 1st, 2nd, and 3rd form Freeza... And maybe even preformed decently against the extremely low percentages of his 4th form... But they still weren't remotely close to 'full power' 4th form Freeza.
Not even base Goku at the start of DBS/BoG was on Freeza's level(per Beerus.)
That said, they could still potentially kill Freeza IF, say, Tien managed to successfully deliver a Neo-TriBeam, or IF Krillin managed to land a Destructo Disc... But those are obviously one-offs that Freeza could likely avoid if he didn't fight like a dipshit.
Never let anyone else define you. Don't be a jerk just to be a jerk, but if you are expressing your true inner feelings and beliefs, or at least trying to express that inner child, and everyone gets pissed off about it, never NEVER apologize for it. Let them think what they want, let them define you in their narrow little minds while they suppress every last piece of them just to keep a friend that never liked them for themselves in the first place.
Yeah, Krillin would either have to decapitate Freeza(it may not kill him, but it should still incapacitate him), or he'd have to spam Discs and chop Freeza into a bunch of pieces(which should incapacitate him as well.)
Yunba used some sort of special 'Sonic the Hedgehog-esque' maneuver to deflect the Discs. Without that, he was susceptible to them(a Disc cut him shortly afterward.)
Either way, I have no clue how powerful Yunba is... But the fact that he gave Krillin a good fight suggests that he is WELL above Namek-saga Freeza, imo.
Like I mentioned above, the Disc would either have to decapitate Freeza, or chop him up into a bunch of pieces. May not kill Freeza, but it should incapacitate him.
Barring that, I agree with you. Aside from characters with regen(obviously), Freeza's damage soak is the best in the series, by far.