Okay but the weapon you use doesn't matter as long as you're good at it. And 95% of people agree that the unscoped varient is far superior to the scope because it allows for more movement and flexibility while still using a charger. Also the situations you described earlier for certain picks on certain modes are certainly not game-defining unless you're in like C rank. Sure blasters can clear the tower easier, but what really defines every game is what goes on outside/off the objective. If you can't win your 1v1's you lose and there's no debate to that. You need to pick weapons based on their ability to perform on certain maps and modes, and not just picking a brush on clam blitz just because you can run around. People in S+ are smart enough to notice your tendencies, like I once came upon a blaster running 12 swim speeds and just suicide ran with the rainmaker for points not actually trying to kill anybody. I noticed this fairly quickly and it allowed me to shut him down. If you're just using a blaster on tower control to kill people on tower if I see you while riding tower I'm just gonna hop off and kill you, or just never get on the tower until I kill you. All in all using atleast mid-tier weapons, as long as you're good at them will give you good success. Also choose weapons you like, which will give you more motivation to get better at it. You're thinking way too basic on your weapon picks.
But back on skipping ranks I don't know, man. I think it was The One who posted a pic from splatnet where he got like 7 knockouts in a row in zones, and his rank only went up by 1. But at the same time, some people have skipped with 3 cracks. I don't think you can ever skip ranks again if you missed earlier opportunities to do so. People say maybe there's a power level requirement but despite ranking up with 0/1 cracks in 2000-2100 lobbies I never skip. Doesn't matter too much to me anymore because I'm gonna be X rank in about a month, but in case you're wondering, I got here with Hero Charger, Slosher, Slosher Deco, Mini Splatling, Hero Shot, Gold Dynamo, Custom E-Liter 4k Scope, Blaster, Range Blaster, N-Zap 85, Heavy Splatling Deco, Firefin Scope, Splattershot Pro, Forge Pro. I think those are all the weapons I've used for at least a week straight in ranked For the past 8 months.