Quote ="Rhinos Fan Pam"Pretty sure the rule states that you can't take part in that passage of play if you are offside at the PTB. '"
I'd agree with that interpretation. You mentioned Webb at Odsal but more recently there was one in the St Helens - Warrington QSF the week before the GF.
Quote ="Rhinos Fan Pam"One of those contradictory rules because if your team kick ahead, you can be involved - giving them 10, kicker going ahead of you etc. If your team keep the ball in hand, you remain offside until the next tackle
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Don't think it's contradictory. If you are in front of the kicker (but were onside at the PTB) then you can become involved in the play by doing as you say - giving 10. If however you were offside at the PTB before the kick I'd imagine the same 'downtown' rule applies and you have to stay out of the play.