The finish from Gross was more inside the box than on the edge of it. His feint that sent both defenders the other way was on the edge of the box, the shot not so much. But you do raise a valid point regarding the different models. It's surprising from Understat because they are usually very generous with their stats. It may not be a 0.30xG chance (which is the bar for a great opportunity), but with both defenders out of the picture and the whole goal to aim at, i tend to believe that it's closer to that than to a chance that finds the back of the net once in every ten attempts (which is what Understat suggests).
Other than that, i want to share your optimism. I'm currently caught between two minds. A part of me wants us to keep pushing because, if we somehow survive the hits, we'll have taken a step forward in some key areas. What i don't want us to do is go back to a mid-block and hope to win games on the counter. It may save our season again (it did last year), but it's like trying to fight chronic arthritis only with cortisone. Instant pain relief vs proper treatment. On the other hand, i see ETH making other baffling choices. You'd expect from an Ajax manager to at least respect some of the basic principles of positional play. As the days go by, we seem to be moving further away from any notion of that. I don't know what to think.
About the high press, i've argued elsewhere that it was one of his biggest weapons and also one of his weaknesses at Ajax. It's more man-to-man oriented, and that's why (don't just look at yesterday's game), it looks more effective when we press from the front (i.e., in a dead ball situation) and the opposition players' positions are more fixed and our lads can work with a script instead of making decisions on the fly. But the nature of this press makes you vulnerable if one of the chains breaks. He's got big wins and big defeats by playing this way. Whether he can turn it into a strength for us in the PL, it remains to be seen.