slater is probably the better one to look at. his positioning is outstanding the phrase right place right time is said alot when he is involved both defensively and in attack.

he is exceptional at the basics but also has that flair that can create major problems.

Brett Stewart and Billy Slater are the two stand out fullbacks.

Way to miss the point. We're talking about a youngster learning the position. Slater's strongest attributes are his attacking skills, pace and flair. But I've never seen Wellens hurl the ball blindly from the touchline to give away a try, or show real fear and duck out of a tackle when faced with a big runner (as he did when Tony Williams ran at him). A great example for a youngster. Wellens rarely fails to get the basics right and is a very good role model for any youngster aiming at that position. He might not be as flash or exciting, but he does everything consistently well.

Slater is the world's best full-back for his attacking and support play, which is simply a level above. But he's not, and never has been, the greatest defensive full-back. Full-back is a primarily defensive position - especially, and here's the key - for a youngster learning basic skills and the game in general. I'm not say "Wellens is a better full-back than Slater" (frankly I don't care), but he's a perfect example of doing the basics well and a good role model for the position.

A kid learning the position needs to spend his time learning the defensive basics. They're the most important skills by a long way at full-back. He can worry about full-back attacking and support play, etc, later.

Just ignore Cronus, let him wind himself up and throw a tantrum as usual

Cronus is spot on, assuming the OP's son is under the age of around 15/16.

Bet you have.

Gary Hulse

Cheers chaps my is twelve. he is tall and slim but deceptively strong. so i wanted him to watch a player who can time his run when joining the line. he is fairly quick too so i didn't want him to watchand copy someone who is totally different in body image. imo he would be better at looseman but Im not his coach. thanks again.

In what way does he get 'lost'? I'm not sure watching professional fullbacks would be all that useful, since they are involved in highly structured and organized team performances and the majority of what they do will be tailored to suit the needs of the team. If he struggles positionally, he just needs to learn to be confident in his ability to anticipate where the ball is going to go. At a very basic level, just tell him to stand in line with the play-the-ball and follow the ball across the field so that he is in roughly the right place to clear up any breaks or recover kicks - his positional play should hopefully develop from there. The same goes in attack - just tell him to be aware and push through on the shoulder of his teammates. He's probably not going to be involved in any more complicated attacking moves at junior level. Maybe watch Sam Tomkins or someone, but all fullbacks do this.