Does post position matter in Kentucky Derby?

Kentucky Derby 148 - Rich Strike scratched in to the race the day before - and many handicappers probably didnt even look at his past performances. Watch the horse in red and white with red-hatted jockey at the very far left, number 21. The gate opens and Rich Strike enters the fray almost leisurely and scoots at jockey Sonny Leon's direction toward the fence behind the rushing sea of horses. As the pace heats up in front he trails, but remains to the inside and in position at the final turn where the rail is open.  The two favorites begin vying closely, and Epicenter seems to have it over Zagnut. Oh there is one lagging railer in front of Rich Strike, but Leon guides him around that one as you would deft switch in front when lines when line 4 opens at Safeway. There is some surprise in Joel Rosario's visage as Rich Strike comes through at 80-1.