It’s not Tyreek Hill refusing to play last year, not his demanding a trade, not his showing up late to practices, not quarterback Tua Tagovailoa saying their relationship still needs work, not the $15.85 million roster bonus he’s due this month, certainly not any of the off-field drama he brings — none of this is why the Dolphins’ top player remains at the center of trade speculation.

It’s the Dolphins offense that didn’t work last year.

It’s the Dolphins season many expect to sink this year.

It’s the top-shelf talent Hill remains at 31, too, that’s causing NFL general managers to circle like buzzards in August, according to ESPN’s Jeremy Fowler .

All true, too, a league executive confirmed.

“You could say people are sitting back, waiting and seeing what happens,’’ the executive sai

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