Hmm. To my ear, he definitely had Marvell in mind, though to what end I can't say. Good question. OTOH, I agree that if Wilbur had echoed Marvell, he'd have a good reason for doing so. His poems are limpid distillations of protracted thought. Or at least, that's how they seem to me.
I discovered Edgar in this thread. I do like the two poems I've read so far, but as someone, I forget who, noted, poetry is easy, thinking is hard.
Update: it was perhaps Richard Wilbur.