Amazing. Some here couldn't wait to get Ginn out of Miami and yet they still can't stop talking about him. The off-season is way too long.
To correct something the writer wrote. Ginn averaged 24.9 yards per return not 21.9. He also finished 9th, based on those who actually qualified, in the NFL not 30th. Ginn also finished 6th with 34 returns of 20 yards or more and tied for 8th with four returns of 40 yards or more.
As a team, the Dolphins finished tied for 5th with 45 kick returns of 20 yards or more and tied for 10th with four kick returns of 40 yards or more. Overall the teams finished 11th in the NFL in kick returns.
To quantify the statistics you pulled, he was the 10th best KR if you only count KRs that had 30 returns or more (can't figure out how he could place as 9th), of course, there were only 21 KRs with that number of returns which makes him middle of the pack.
You mention that he finished 6th in 20+ yd returns and 8th in 40+ yd returns, but didn't mention he was 6th in total number of returns. Therefore, if he was average, you would expect him to be 6th in both categories, if he was above average he would be higher than 6th, and below average lower than 6th. 20+ yd returns he was average, 40+ yd returns he was slightly below average.
The team stats are probably the best indicator if you quantify how many of the team's KRs he handled.
Really who cares? He's gone and will get another chance somewhere else to prove his talent and then one side or the other can bring the "I told you so's"