That makes no sense with what has actually happened, unless you think Dalglish is a complete idiot. Henderson replaces two central midfielders he'd have been better learning from, but then - what, by accident? - actually gets played in a completely different position.
The logical conclusion - assuming Dalglish is not a complete idiot - is that Henderson has played predominantly on the right because that's what Dalglish bought him for. Whether that's where Dalglish sees him in the long term or a learning curve before he moves inside in the future (possibly replacing Gerrard) only time will tell.
But he's not playing there by accident. We do have other options on the right, such as Kuyt or Maxi. Henderson effectively has replaced Kuyt (as a regular starter), not Meireles or Aquilani.
Meireles was deployed on the right quite a few times under Kenny, at the end of last season, we played like this
Lucas Spearing
Meireles Maxi
Suarez Kuyt
Kenny always loved to play 4-4-2 at Blackburn and Newcastle with a proper winger on one side and a wide midfielder tucked in on the other side, that's why we have seen Henderson playing there for so much this season and why Raul was used in this same exact position last season. Aquilani played some games this season with Milan as a wide man in 4-3-3, he is a versatile player so presumably he could have been used to fill in Kenny's criteria in that role as well.
Not to mention that if Kenny wanted to play Henderson in the middle, he for sure would have been helped to have Lucas by him side, but the movement of Suarez, Aquilani & Raul could have helped him find more spaces than he finds right now and become more settled to the team.
I'm afraid, we really bought Henderson and we weren't so sure of his best position, again, this could have been helped if Raul & Aquilani were here and Henderson was used in games after matches were won, he could have adapted better to the role Kenny wanted to play him while not being the focal point and having so many people watching his every move which added extra pressure on the lad, because the way I see it is that, playing him week in, week out this season has killed his confidence which is evident right now in his game.