Sad to say but you are wrong. The hashrate displayed on the pool is calculated from the amount of shares accepted so if the pool shows a similar hashrate between two people, it means they have submitted about the same amount of shares. Hence, they are submitting shares at about the same rate.
What comes to the uber profitable coin it could certainly be true if we only looked at a very small time frame but we are infact comparing several days. There is no uber coin in existence that could create a 10-30% difference in 3 to 5 minutes, not even if there were several of these situations as Bob still has a higher overall hashrate.
Oh thanks for the clarification.
I have 2 rigs with just 1 R9 280X GPU and both have the same settings and hashrate.
I'm usually on eu server and I switched 1 rig to uswest :
Before I switched, the 2 rigs were almost synchronized : diff changes occurred at the same time or with just 1s delay and rigs were apparently mining just the same coins at the same time with the same diffs.
After I switched things were almost the same : delays are around 1 s but sometimes it can be greater (exceptionnaly up to 60 s). That's generally uswest which is lagging more for me but not always.
Sometimes, as the diff changes don't appear at exactly the same time, the diff for the coin is a bit higher for the rig mining on the lagging server.
I need to check the logs a bit closer but I saw that difference twice in 1 hour. US west server got a higher diff once and eu server once.
That's really very small differences. I can't say it could produce large payouts differences.
Apparently, both pools mine the same coins, with most of the time, the same difficulty.