The remains of the sheep is an image that does embody multiple meanings, as discussed in the thread dealing with this scene.
Perhaps Ennis heeded the premonition -- but alas, in the wrong way! 
Wrong I would say, sure.

The
usual way, yes.
Ennis responds to devastation in a very prominent, stifled manner, no?
I think if Earl had ever been swallowed, overcome, he was then brilliantly displayed in that sheep's crimson open-gut stage.
Stage fright/Ennis - day/night.
I've been intrigued by the similarities in these Ennis lines, checkpoints around the mountain so to speak:
Ennis: This is a
one shot thing we got goin' here.
***
Jack,
pulling a sheep by its hine legs: f*** Aguire!
Ennis: f*** Aguire? ...
we gotta stick this out, Jack.***
Ennis: .. if you can't fix it,
you've got to stand it!

Jack: .. for how long?

Ennis: As long as we can ride it.
***
Jack: What are we gonna do now?

Ennis: I doubt there's nothin' we can do.

***
Now, these aren't necessarily double meanings but they filter out like pebbles of fool's gold in my mind, especially once we see Ennis collapse in Jack's embrace:
I can't stand this anymore, Jack, ahh! :\'(
I think Ennis was wiser than he'd thought himself, saying what he had. But it was so impossible for him to hear anything other than the wicked chimes of the once Earl. And now Ennis hears chimes again, the rhythm, the melody of Jack, a man with whom he'd found love
without condition, blowing over the grass of the great open plain. Something that will never die as long as the winds still blow. This must be hauntingly beautiful music in his ears.
And replacing Earl, replacing the lame, still-framed sheep, this one here is his.
And always will be.

:\'(