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This isn't to suggest that Floyd is going to be the next Harrison. It's not even suggesting he specifically resembles any one of these guys. It's simply evidence of what a quality wide receiver can be for the future of a team before acquiring the quarterback.
Most wide receivers need an adjustment period in the NFL, and it is better for first-rounders to develop without the presence of that star quarterback adding pressure to be an impact weapon right away.
Harrison had two years of growth before Peyton Manning showed up, and the guy that never had more than 866 yards in his first three seasons shot up to 1,663 yards by Manning's second season.
White would eventually shake off his career's early struggles to become the crucial piece in Matt Ryan's rookie season success.
Johnson's rookie season gave hope of greatness, and, now, he's only looked better with Matt Stafford passing to him.
On top of that, a developed wide receiver is a huge asset to a quarterback (rookie or other) transitioning into a starting spot.
Matt Schaub joined Houston with Andre Johnson, and they became a potent pass attack not long after. When Tom Brady took over the New England Patriots, he had Troy Brown there to help his transition. Aaron Rodgers finally got his opportunity to start in 2008 and already had quality receivers (Donald Driver and Greg Jennings) in place and waiting for him.
This example is definitely speculative and circumstantial, but it's hard to deny the track record. If Miami starts putting the pieces in place now (starting with Floyd), they could have a winning combination ready within the next two seasons.