Leicester supporter here!
I look at Walsh the same way I look at any high up manager in everyday business, there's a lot of other guys behind the scenes doing the leg work that the manager goes on to take the public credit for!
We've still got the majority of the scouting network he set up at Leicester, and we're continuing to sign players like Ndidi and the young Mali player Diabate who have in all respects come from nowhere to be signed (the sort of thing Walsh was 'famous' for)
Having said all that, he's worked above two very head strong managers who clearly want to sign their own players. I can pick out Vlasic, Lookman and Onyakuru (no idea why you haven't recalled him!) as being Walsh signings (who could still prove successful?) under Koeman, the rest were clearly Ronald's own ideas! Similarly with Sam, Walcott isn't the sort of person Walsh would traditionally identify, Tosun perhaps but Walcott is a Sam move for me.
So it leaves me to wonder what is he supposed to do? For me he is a Chief Scout, not a public facing DOF, if he was a chief scout and had the chance to build that team out I think you'd see more success from him.... promoted beyond his station for me.
As for the left back situation, whilst I understand everyone's anger at that not being resolved, can you honestly name a list of suitable/achievable targets? We're blessed beyond belief at Leicester to have an experienced international and a young England prospect in that position, we'd be [Poor language removed] if we didn't!
All due respect a replacement for Baines should have been lined up and groomed as a replacement long before Walsh arrived. (p.s. Martina is one of the worst footballers i've ever seen in the Prem)