The only reason overall rating is irrelevant is because the fact that other irrelevant stats that is put inside their rating such as AWP KPR. Cold plays awp while krimz don't and when you put in stats like that into overall rating, it will not be fair. Surviving stats is also irrelevant as the player can just save every round and have higher rating than the other player. That is why if we want to compare individual with another individual, we only need ADR, KPR and Impact.
If you see the past hltv ranking, they don't care about how many maps the player play in a year. They only look at the stats and right now you can see that Krimz stats is better than coldzera individually.
So no matter if Krimz go in top 20 or not, he still have a good year and it is nice to see him coming back to form and congrats to cold for being top 10.