What does PWHB mean?

Power Half Back
Power Half Back. PWHB. The player who handles carrying the ball on a very short yardage situation especially near the goal line. Generally is the running back with the best Breaking Tackles (BTK) and Trucking (TRK) attributes, which is usually your starting half back.

What is RDT in Madden?

Nickel and Dime defenses now use Rush Left End (RLE), Rush Defensive Tackle (RDT), Rush Right End (RRE), Sub Linebacker (SUBLB), and Slot Cornerback (SLCB) positions. These players are best for downs when the offense is likely to be throwing the ball.