Saints fan here.
Walker-Peters is by far our best full back. Vastly superior to Livramento (although Livramento is just starting out). I’m sure that 99% of Saints fans would rather sell Tino above KWP.
He plays LB for us as Tino was better than Perraud at the start of the season. There wasn’t much drop off, as good on the left. He also plays as 6 in training so I can see him moving there in the future. Many Saints fans have wanted him to play the number 10 role also as he is out most creative player.
I think he can easily make the step up. He is a tier below TAA, James, Cancelo but he is probably in the conversation to be the best in the tier below.
Wouldnt want to sell but have to be realistic. 15m and AWB may suit both clubs.