A deal with a heavy incentive is appropriate for a player with an average of 5 games a season over three years - Its hedging. Yes we want him, but we need him healthy. If he can't make it back we have invested and lost money, but not sold the farm. If he makes it back, he earns an appropriate amount of money.
If he can't make it back (and he has already demonstrated he can), you will be up for 5yrs x $600k (reportedly) under the current offer, which gets only band 1 compo.
Why not offer him 3 x $700k, with 2 more yrs based on games played? If he breaks down, the cost is $900k less for Brisbane.
Brisbane gets him for free trade wise, is no worse off salary cap wise (swap $100k of incentives to base), Essendon won't match if it gets rd1 compo.
Deal done, everyone fine.
And please don't tell me Daniher won't be happy because he wants 5yrs of guaranteed money. He has just had 3yrs of big money hardly taking the field. He couldn't possibly be upset with a guarantee of "just" 3 more.