From Jakob's interview after European XC Champs:
"If arrogant is believing in yourself and believing in your work then, I mean... that's a weird definition of arrogant. I think you need to be some sort of arrogant, but you can't be a douche or an xsshole. You need to believe in yourself, and if that's arrogant then some people are idiots."
I think Jakob embodies that 2nd sentence perfectly. He believes he's the best and isn't afraid to say it, but at the same time is respectful to his competitors and doesn't make excuses when he's beaten.
He took silver in the last two world 1500m finals (that most agree he should have won) and look at how he handled it. In Belgrade, he congratulated Tefera and called him the better man on the day. In Eugene, he congratulated Wightman and had nothing but good things to say about him in the interview. The only "sour grapes" comment was "[Wightman] also realizes I didn't reach my potential today" which was just Jakob saying out loud what all of us were thinking.
Regarding Jake's comments, I don't think anything he said was contradictory. He and Jakob have both spoken very highly of each other, and the "sore loser" remark seems more about Jakob's anger/disappointment at losing than any bad attitude towards Jake. Both guys are easy to root for and I look forward to seeing them race each other again.