Q u o t e: It has nothing to do with needing an ally to help, its always nice to have someone help you with that, but it isnt necessary.
What you have to do is to is to first scout around your base for any critters ,invisible critters, units, heros, invisible units, invisible hero(s), and scout farms. Then build up a barrier to your main so that nothing can get in. Then get 3 staffs of tp + 3 boots of speed and put them on your heros use your heros to harras the expansions that have the least towers, this forces the human to play on the defensive and not on the offensive, if the human tries to mass tp to your base, you use your staff of tp on all 3 of your heros to go directly to your army and do the standard fighting that you should be doing. When you win the fight which you should, take the fight directly to the humans base and win the game.
Didnt say ffa was easy =\
Wtf can heroes with staff of TP do against a whole human army of AM/MK/Paladin and Knights/breaker/gryphons/casters/tank.
You can't even use a scroll of TP to defend because any competent human player would focus your main hall with tanks.
If you want to bring the fight to the human base, the human would just %@!% your main base, mass tp back to defend, then you will be fighting against a whole army + 20 towers.
Seriously, wtf can you do against a human who @##@@s 3 gold mines with an 80/80 army, level 6 AM, and 15+ towers at every base.