I had to laugh a bit. In one sentence it is mentioned the league is built for parity and then in another sentence there is a complaint about having average talent on the team. In a league built for parity shouldn't everyone have average talent?

i didn't complain that this team has average talent, it's just a fact.
having a league built for parity doesn't exclude the fact that you will have elite teams. most teams will be average with average talent, a few will be terrible with terrible talent, and a handful will be elite with elite talent contending for championships. the dolphins are right in the middle, and won't be contenders until they get more players that are better than they have on the team right now.
coaching is not the problem for this franchise. cowher, gruden, lombardi, shula, <insert whatever coach here> are not going to get this team to another championship.