Also it seems that Garou's portal range seems to have a limit as he needed to be in relative proximity to Earth in order to travel there.
For speed, I think it's best we calculate Saitama sneezing from Io all the way to the point he could see Earth in the distance, or we can use the Io ping pong thing.
AFAIK, most are seemingly leaning to 4-A. GOD shouldn't have a physical rating atm, but he should haven an "At least 4-A" AP via him granting Garou a fraction of his power and casually killing and taking them away. I guess he should also have deconstruction and life manipulation.
Blast with his spatial manip could hold Saitama's and Garou's 4-A attack for a limited amount of time., I think that Blast should get "At most 4-A with Spatial Manipulation" since this is a feat he did with hax and not physically. He should scale to both Saitama and Garou in speed as he was able to take an early cosmic Garou by surprise as well as activate his powers before Saitama and Garou could punch each other.
I'd say rating would be like
GOD: At least 4-A
Blast: 5-A, possibly High 4-C. At most 4-A with Spatial Manipulation
Saitama: 4-A, higher with Accelerated Development
Garou: 5-A, possibly High 4-C, up to 4-A with Power Mimicry, higher with Reactive Evolution
I'll add more later on as I'm a bit busy atm.