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.