It's been a strange experiment all round. In his first season he didn't get the whole transfer window to stamp his authority and I'm convinced he tried to replicate Leicester's system and style of play on us Wes Morgan (Ashley Williams), N'golo Kante (Idrissa Gueye), Rihyad Mahrez ( Rachid Ghezzal) and Jamie Vardy (Lucas Perez) - obviously we never ended up signing the last two but we tried very hard according to reports at the time. I think Yannick Bolasie was probably a Koeman signing.
The January window saw Lookman arrive (almost certainly a Walsh capture) and Schneiderlin (definitely Koeman's pick) and the latter really pushed our season onto another level as it had been fairly mundane up until that point. Koeman also made some subtle digs towards Walsh after we crashed out of the FA Cup to Leicester as the Schneiderlin transfer was taking so long.
Nothing more needs to be said about last summer, an absolute failure in every sense of the word. If Walsh was to get sacked tomorrow I don't think one Everton fan would seriously miss him but if players like Pickford, Keane, Vlasic, Onyekuru, Lookman, DCL and Sanro all grow into exceptional players (even just a few of them, Pickford is looking like he is top class already) maybe we'd look back and regret sacking him.
Critical time for the board coming into January. You can't have a DoF and the manager making their own signings, it simply won't work. They have two options as far as I'm concerned:
1: name the next manager a 'Head Coach' and give Walsh absolute autonomy when it comes to signing players.
2: throw Walsh on the scrap heap and go back to Moyes days where the manager dictates everything and makes his own signings too.