I personally think Koeman overpowered him in the first year of the job. The likes of Williams, Klaassan, Martina, Sig, Bolasie and Rooney were all probably players that Koeman insisted on. Same with Giroud which is why we went all out for him and were left high and dry when he bailed.
Walsh’s fingers look all over Gueye, Pickford, Keane, Sandro, Vlasic and Lookman. Which, when you break it down, doesn’t look too bad. His failure to provide a back up to Giroud and any left back whatsoever are blotting his copybook but I think we can lay a lot of blame at Koeman’s door as well as Walsh.