I always wonder what would happen if NFL teams sign a retired NBA player as WRs. NBA is a league that is the most selective in the US, and that's where all the top athletes play. A lot of these players have had high school football playing experience.
For example, Calvin Johnson is probably the most physically gifted NFL receiver we've ever seen. I remember every week hearing about how strong he is, how tall he is, how he physically dominates his opponents. Calvin Johnson is 6'5, 236. In the NBA, he is equivalent to a shooting guard, such as James Harden (6'5, 220.)
If NFL teams sign a flamed-out NBA player who might still care for an NFL paycheck, for example, Tyrus Thomas (I think he made too much to care for an NFL paycheck, but this is just an example - 33 years old, 6'10, 225) as opposed to AJ Green (31 years old, 6'4, 210), I wonder how it would play out.