"So you're saying that, in your view, the greatest poets of all time were Vergil's primary influence, the two poets he most greatly influenced, and Vergil himself, and you're arguing that he's not as influential as Shakespeare?"
Yes, because Shakespeare's even MORE influential...
Look at just about anyone who came after him in English literature...at least 4/5 of them draw on Shakespeare.
Look at the Russians--Pushkin, Dostoyevsky, and Tolstoy are arguably their most world-renowned writers (and yes, there's Gogol and Chekhov, just saying, renowned.) The first two? Heavily influenced by Shakespeare and pro-Shakespeare...the latter? Influenced by way of his hatred of the Bard.
Which is another, albeit ironic thing--Shakespeare even shapes his detractors...
People who don't like Vergil just don't care for him and move on, but disliking Shakespeare informs who you are as a writer in itself.
And while he's in an elite class, I'd definitely rank him the least of the Homer/Dante/Vergil/Milton group...the only shuffling I could possibly make there is to say he maybe could take over Milton's spot at #3, but I think Milton's had a bigger philosophical and theological impact, challenged the status quo a lot more by daring to arguably make Satan into an anti-hero and God into a character that's kind of hard to root for, and maybe exploring the philosophical Problem of Evil greater in one poem than any other single work of literature.
And while doing away with the +1s would put Shakespeare back in the lead...
Yeah, we should count them as they've already been cast. Damn. Lol.
Alas, poor Shakespeare...you deserve to move on to Round 2, but you're up against a fellow titan.