Okay,i'm just going to make a quick timeline of what would have happened if he stayed with WWE
August 28th,2009-Jeff Hardy loses to CM Punk in a Steel Cage Match for the World Heavyweight Championship with the stipulation of "Loser Leaves WWE"(Kayfabe).Let contract run out to heal injuries(2 Herniated Discs & Restless Leg Syndrome)
January 8th,2010-Jeff Hardy re-signs with WWE & makes his Smackdown return attacking CM Punk while Punk he's cutting a SES promo
January 31st,2010-Hardy wins his spot in the Rumble & lasts a long time but fails to win because of Punk
Elimination Chamber-Hardy is close to winning but loses the WHC Elimination Chamber Match.Hardy feuds with Punk until the Chamber match.
Wrestlemania XXVI-Jeff Hardy Vs Edge Vs Chris Jericho World Heavyweight Championship. Hardy would come up short but have most of the best spots in the match.
Extreme Rules-Hardy would face Edge,Jericho,& Punk in a TLC Fatal Four Way because Hardy & Edge are both most experienced in that type of match,but would fail to win again.After ER,Hardy would take about 3 Months off to relax & take time off,but still signed to WWE
Summerslam-Hardy would return & join the feud with Team WWE against Nexus,leading into the Team WWE against Team Nexus match along with Cena,Hart,Edge,Jericho,Morrison & Truth.
Bragging Rights-Hardy would join team Smackdown along with Big Show,Mysterio,Swagger,Del Rio,Edge,& Kingston.
Survivor Series-Jeff would feud with Edge & Kane up to the PPV winning the WHC by Swantoning both Kane & Edge while one was pinning the other.
TLC-Hardy would defend the WHC against Kane,Del Rio,& Edge in a Fatal Four Way TLC match,retaining the title meaning WWE would be pushing the hell out of him again
Royal Rumble 2011-Hardy would defeat Edge & Ziggler in a Triple Threat Match
Elimination Chamber-Hardy would lose WHC Elimination Chamber Match to Edge
Wrestlemania 27-Hardy would fail to regain the WHC in a Triple Threat Match against Edge & Del Rio with Edge retaining.Hardy would take a huge amount of time off.
Summerslam-Hardy would make his return attacking Christian & Orton but still as a babyface
Night Of Champions-Hardy would lose against Orton & Henry with Henry winning the title.
After that Hardy would be put back down to Mid-Card because they wouldn't have any room for him to be main eventing