I believe that there is more to come from Garner, but regarding your last point and Dyche, I think this analysis of his time at Burnley explains what we are seeing now.
https://mtfreport.substack.com/p/dycheball-decoding-the-tactical-mastery
His all round/link play has not been the bedwetters have been crying about. They think he should be going for the golden boot redardless of how Dyche sets the team up.