He's a confidence player and he's also a chaos engine.
If you're going to play him he needs to start and you need to be during balls up to him / crossing balls into the box.
Asking him to come on for 10 mins to chase hurried clearances upfield and close down multiple CBs on his own is setting him up for failure.
He's 6'5" and strong as an ox. He's not a whippet like Ohashi - don't ask them to play the same way. It's not rocket science.
And for clarity - I think he's a 10 goal a season striker if you played to his strengths, but he'd have a load of assists (and just generally disrupt the defence and cause chances to break for others).