It's not helping Rodri that we're overstating Fernandinho's impact here (exact same as Jesus with Aguero too). And it's unfair on him for any of us to do that. Obviously Fernandinho has been brilliant for us and will rightly go down in folklore as a legend of the club and an all-time great, but if he was so solely important then 16/17 would have gone much better and 18/19 would have seen a collapse without him.
We probably would have done a bit better with Fernandinho in DM this season, assuming his legs wouldn't have gone. But we would have had all the problems we still had, and we probably would have lost many games in the same fashion too. We still would have had no worthwhile CBs for most of the season. We still would have been vulnerable on the counter. We still would have missed chances up top. And then on top of that we would have had no contingency for next season when it's almost certain Fernandinho wouldn't have had the legs to go for a full season. We would have to have relied on Gundogan, and the way you all talk about him on here makes me think you wouldn't have liked that.
I'd wager that if the exact same Rodri we've had this season was playing for us in 17/18 or 18/19, this thread would be five pages long with most of us in agreement he's top class.