How many assists do fullbacks generally have though? It seems a bit of a myth that they weigh in heavily - aside from top drawer attacking fullbacks, and then we're most likely sacrificing something defensively, on an already leaky backline.
Milner always supports the attack, works hard and overlaps and puts a decent ball in a fair amount of the time. I agree we could improve on delivery, from both full backs, but by and large I think we could do a with a full back who's alot more positionally sound and solid - which Milner obviously isn't so natural at.
Our attack when functioning, with the addition of one or two more players who weigh in, should have enough about it, without heavily relying on attacking brilliance at fullback. We could do with a bit of balance, in having one who's more attack minded, and one who is a natural defender and will tuck in and tighten the space when needs be. There's room for improvement definitely, but we need balance in that respect too.
It's not really about assists in terms of stats - I knew mentioning Dani Alves wasn't the best idea as he's a freak of nature and isn't your typical fullback - but how they can help the team overall.
I'm not saying Milner is a poor player or that he hasn't contributed more than his fair share. He's been excellent all things considered.
As you say, it's about balance.
On the right we have Clyne who is pretty solid but limited in his ability to contribute attacking wise. I'd like to see a natural left sided player that can help us stretch teams out and give us a genuine attacking outlet.
If we're going to get a LB and we are, I don't think it's a position we should scrimp on if there are top class options available.