I honestly wouldn't take his fight against Zamasu as an indication of anything, @Keedounan. It's just pretty inconsistent if you think Zamasu wasn't holding back, which is likely the case based on Kaioshin stating the other Kaioshin's level of skill doesn't compare to that of his, or something along those lines. Considering Kibito should be weaker than base Gohan, he somewhat managing to keep up with a Kaioshin+ level foe just doesn't fit.
@Captain Cadaver --> whilst Kaioshin not including Kibito may indicate this latter isn't strong enough to one shot Freeza, wouldn't you have to conclude [androids saga] Piccolo is also not strong enough to instantly defeat Freeza based on Kami's statement when going by this line of thinking?
Chapter: 356 (DBZ 162), P3.1
God: “Things turned out this way against the androids…Even for that ‘Trunks’ boy who came from the future and instantly obliterated Freeza and his father…and even for Vegeta, whose abilities are even greater than Trunks…”
The argument would look pretty similar, in which he adding Piccolo to the "instantly defeat Freeza" group would just further add into how the situation was hopeless as a whole. It'd be, much like if including Kibito, further driving the point home that the Saiyajins just aren't on the androids' leagues, as the androids are stronger than the SSJs who are stronger than Piccolo, and if this latter could also instantly defeat Freeza mentioning him would serve to hyping up the SSJs and consequently the androids, the same way mentioning Kibito would hype up Kaioshin and consequently Boo.