My thought about how to change devourer
In the last season, a jungler could get devourer around 9-10mins and finish sated devourer around 19-21 mins.
In S6, the item devourer often goes to two extremes. One is you get both herald and dragon in early game. Then when you finish sated devourer around 16 mins you can use this power burst to easily win the game. The junglers (Xin Zhao, Yi) with sated devourer can at least 1v2 or even 1v3 at this time. Another extreme is he can't finish it in the whole game because he doesn't get dragon or herald. After 20 mins, the monsters are cleaned by his team or enemy's, so he can never finish it.
The new epic monster - herald gives the same stacks as dragon. This changes makes the progress to finish sated devourer much faster than S5. We can often see a jungler get sated devourer around 17-18 mins.
Therefore, can we add a limit to hunt epic monsters? you can only get 5 stacks for hunting epic monsters every 6 mins. In addition, to make the progress more smooth, you can get 1 stack every 180 sec after you buy devourer. From 9 mins when you buy it, to 20 mins when you usually finish it, you can get 3 or 4 stacks from this passive. Furthermore, after 15 mins of buying devourer, this interval will decrease to 150 or 120 sec
I think this can help those junglers who have a tough early game to make the whole progress more smooth.