I wouldn't get too hung up on time to command or RHS 330. Its a veritable moveable feast at the moment with all of the recruitment and new aircraft coming online. A lucky few have seen the 330 RHS after just 2 years but the majority in the last while were 4-5 and the average before the "boom" was 6-8. Some people never saw the 330 before command came around.
7 years for command is stretching the truth it a bit. For next summer there are a handful of 330 copilots that would sneak in around that vintage that are going through the upgrade process at the moment or have recently passed the checks. There is something like 30 promotions planned for summer 2019 but the majority would be around the 10 year+ vintage.
Like all seniority based airlines its all about your date of joining.