to be fair to OG i thought the same last season and then suddenly it came good. Looking back on that run, 2 of the big factors were Wharton getting up to speed with the Prem and improving his fitness to last 90 minutes (when he arrived he was spent after 60 min) and Olise's return to fitness. This then impacted Eze and JP who are clearly confidence players. You could argue we have 'lost' all 4 at the moment.
I think 3 of the things a manager has to do is pick a system that best suits his players, adapt to situations and when players move on/come in and during games and finally give players the support/motivation to go out and perform (some need a strong talking to, others need an arm around them - it is for the manager to work out what makes each person tick).
OG is clearly a good manager, you don't get a team into the Champ League or win a major European trophy if you are not.
However, he does seem amazingly inflexible in terms of formation, the lack of any attacking 'style' to our play, his persistence with Kamada, and his lack of subs and this is now getting to be a big concern.
Yes Olise is a big loss, but look at Fulham with Mitrovic. He scored all their goals and was a focal point to the way they played. They adapted last season. You could say similar for Palhinha this season too.
Hopefully we will turn a corner but i too am worried