Those three strikers were never in a consistent, direct competition at the same time. They had no reason to face each other at least twice in a season. You are definitely right.
Even Neymar was talked about regularly at Barcelona. Immediately he moved to PSG in a league where no one was actually competing with him, the dude became a somewhat forgotten man.
Yeah, I remember a period where the Cristiano/Messi fight elevated to be MSN vs BBC.
I never thought of it until you said it, but there was a three years period where I only saw Neymar once, and he was only in the stance during the PSG vs United match.