Mitchell Trubisky has been the NFL Draft's hottest quarterback prospect for several weeks now, but with the first-round just hours away, he's suddenly become the key to the first round. In a relatively weak quarterback class, Trubisky has been a quick-riser, as teams became enamored with a quarterback with a big arm, mobility, and limited game tape. Trubisky started just 13 games in college, spending two seasons on the bench behind two-year starter Marquise Williams.