SGC card returned as likely trimmed. Help me understand.

[luciobar1980]

Hey there. First off, I know this isn't pre-war but given this question would really be applicable to any card I thought it would be ok to post here to get more eyes on it.

I submitted this card to SGC a few months ago. At the time I checked the both to NOT slab the card if found to be altered. Now, looking at the card, I thought this was a clear case of mouse chew: the edge of the tear is jagged, doesn't look like someone "cut" or trimmed it. So, it came back unslabbed and "likely trimmed". Why? If this is indeed mouse chew why would they consider that trimming? I measured the card against other 56s and it measures as big or bigger than any i have, and the edges really don't look trimmed. I would find that hard to believe that this card is trimmed in the usual sense. So why wouldn't this grade a 1? Do they consider a mouse chewing on a card as "altered" vs just damaged? Makes no sense to me.