Given playing time of around 4.000 minutes in all competitions, all of the ones I mentioned in that list would provide 8-12 goals and assists (together).
Based on history, experience, qualities, age.

matteo would do well to remember the adage

Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital

Actually what I have been saying is that I keenly support the idea of signing Ben Davies and Matteo has said he doesn't think he is good enough offensively...I actually would prefer to have Ben Davies at the club than an unknown because I just feel the defense needs to click asap.

I understand the point Matteo is making but the plain truth is that if a better player was available that we could afford and was available for transfer right now then wouldn't we be in for him??? Even taking Matteo's vast superior knowledge of players I would still think the club know having spoke to agents who is and who isn't available and at what price.

I hear you, but it's not just about statistics. They only reveal that Ben Davies can't cross and the others I mentioned can.

Defensively....it's about watching matches. I have watched many of them. It's difficult to say who is better at tackling, who recovers more. I don't have these statistics. You could go to whoscored and read some there, but even they aren't that trustworthy. I just can't agree that Konstantin Rausch and Fabio Coentrao can't tackle as well as Davies. I've seen Davies play and I just wasn't impressed. He stood well in defence but didn't strike me as an awesome tackler.
While I know Coentao, I know Rausch, I know Gibbs and they fight and fight for 90 minutes continuously.

Years ago, when Pocchetino was enamored with Ben Davies and bought him from Swansea, I said that Danny Rose is the best English left back and actually third in the world, only behind Marcelo and maybe Alba/Alaba.

People laughed and called me Rudolph, told me I have a red nose They said that Rose is not good enough, that Ben Davies will be a starter, that Pochettino knows what he's doing and he's right in dropping Rose, that Rose leaves too much space behind him.
But I could see the fire he plays with, the ambition he has when he runs after an opponent and when he tackles. Although Rose makes 1 or 2 mistakes sometimes too, he's really solid now both in defence and in the offence. He won this for himself, forced Pocchetino to field him.

Ben Davies may be still young, perhaps he'll develop in years, But he's the risk, not if you bring a player like Rausch, Coentrao, Augustinsson or Platenhardt from another league.
These guys are a certainty, even if they'll not be amazing from the 1st match.
A guy like Ben Davies is not a certainty, even though he plays in the Premier League.

And then there is Rausch who on paper looks like he should be a good left back...but then even he has been available on a free transfer twice and he has never been signed by a top German club.

van Aanholt is waaaay out of Palace's league.
You think Crystal can't get Gibbs but can get van Aanholt?
Arsenal wants to bring in someone else and let Gibbs go, but Sunderland would NEVER give up on van Aanholt without 20 million.