Special Teams are so very interesting to me ... Complicated and Diverse.
Kicking ... Returns ... Coverage ... It ain't that simple.
Kicking
Place-kicker ... requires a strong and accurate leg ... PLUS ... the ability to kick in different types of weather and settings ... PLUS ... perform under extreme pressure ... just one miss at the wrong time, and the PK is a Bum ... Hello Tyler Loop!
Punter ... requires a strong leg ... PLUS ... the ability to place the ball is specific spots ... PLUS ... bad weather, different settings ... clutch/pressure situations.
PLUS ... the timing ... snapper-and-holder for XPs and FGs' and snapper for punts.
PLUS ... blocking schemes ... usually 8 guys on the line for both specialists ... everyone has a job ... just one guy fails to execute his block, not block the right man or let the rusher go a second too early ... blocked kick
Returns
Different skill-set for kick-off and punt returners ... Need Reliable Hands (100% of the time ... for both catching the ball and running with it) ... PLUS, also Need speed and quickness and open-field moves ... and those returners better be able to take a hit.
PLUS ... none of the above means shit without proper blocking structure ... that can be ten players knowing AND executing their assignments, which in turn need to be soundly formulated ... PLUS ... no penalties.
Coverage
It ain't as simple as "run down the field as fast as you can and tackle the guy with the ball"
It's assignment specific ... the structure needs to be properly formulated and well executed ... PLUS ...
the men in coverage need to be able to tackle. If just one player screws-up; and is not where he is supposed to be, when he is supposed to be, or misses a tackle ... the entire unit looks like it has failed.
Oh, and the Special Teams players are mostly back-ups and less experienced players.
One Coordinator with one Assistant, working with 20-25 players every game; and, often not the same players week-in and week-out.
I think of Special Teams as the most diverse part of pro football.
Effort and attitude are huge but far from the whole thing. Coaching, game-planning, structure, motivation, execution and roster construction are all huge factors; and many of the aspects described above are totally different from one another but fall under the broad term "Special Teams"