In general I agree, but not every improvement is down to coaching staff, some are simply down to better team selections. Like AWB benefiting from Greenwood over James, or the defence benefiting from Matic over Fred or Scott. Or the strikers benefiting from playing with other strikers rather than a touchline hugging winger.
I'm sure Ole had his reasons for taking time in implementing the correct changes, but it was a bit frustrating earlier in the season when some of the obvious stuff wasn't being done.