Only forward who would be perfect for Ernie is Harry Kane. Everybody else doesn't fit as long as Valverde remains the manager.
Firmino?Good joke.
Lautaro? Same as Firmino, same as Griezmann. Not a striker in any conservative setups, but a forward playing off a striker, or a mobile forward in a fluid system.
Kane, Lewandowski, Lukaku. These are Ernie-working strikers playing the '9' position. Good luck with that.