You can't really compare the stats of DLC for one game three years ago to the announcement for a base game character this year. It's way different scenarios. But I do say this as a huge fan of both Cloud and K. Rool, both were big news, but Cloud took the internet by storm in a way most Smash announcements just don't. Part of that was probably the sheer surprise factor (K. Rool had been highly anticipated with Ridley's confirmation), but I wager if Cloud was announced for Ultimate alongside Ridley and K. Rool, things would look very different. Also, that doesn't really paint the whole picture because the official Smash YouTube channel uploaded the Cloud trailer a few days late, so most of the views were on mirrors by then.
That said, I dunno if K. Rool and Geno are comparable. At least as far as the actual ballot is comparable, K. Rool regularly ranked in top 5 in polls from that era, while that wasn't necessarily the case with Geno. Perhaps Nintendo could evaluate the character's recent popularity in light of the costume (which has definitely put extra attention on Geno). Again, it's not just Nintendo, but Square that has to navigate this whole deal. Who's going to agree to what? I can't say for certain, but I think the merits of other characters have been downplayed in this thread quite a bit. Understandably so, being the Geno thread, but whatever the Square character is... it's going to be very interesting, because I feel all of them have some sort of barrier for entry.