By Alek Arend According to Andy Reid, Alex Smith is the “greatest thing” to ever happen to Patrick Mahomes. Smith mentored Mahomes in the early portion of his NFL career. The veteran quarterback’s advice clearly translated well. Mahomes has had immense success since taking Smith’s job and becoming the starter. Mahomes’ early days with Smith as his mentor proved critical for his development. “I told Alex, ‘Man go out and have the greatest year you’ve ever had and to you don’t have to teach Pat. We’re here to do that as coaches. You’re out there to go produce and win games and do the best you po…