1: Make a T6 Adventure mode game on your lvl 1 and invite your lvl 70 friend
2: Sit in town while your friend Clears 3 acts of bountys Up to the point of completion "so if its a Kill X monsters + boss quest you friend would kill X-1 monsters and boss, or x monsters and leave boss standing. Your friend can Skip all kill act boss bountys at this point."
3: At this point you can now join your friend. Open a rift and clear the Whole rift. Do not collect the completion bonus.
4: Do all bountys in the remaining to acts to completion DO NOT collect Cache rewards.
5: Go to westmarch commons Do all 4 side quests there
6: Complete All bountys that are left doing Kill act boss quests first and kill x monsters plus boss last
7: Collect all caches and rift completion bonus. You should be lvl 70 and recieve lvl 70 rewards for all acts and the rift
I hope you guys enjoy this. I Personally feel this is and exploit due to the fact its Munipulating the way quest function.
It takes about 1 hr 30 min if you do this efficiently. and yeilds around 10m gold for Both players and 5 para lvls for your lvl 70 friend "at 250 para or so"