To me, what's "remarkable" about these remarks in the Jewish Council is actually two-fold: it's what they admit about Jesus and how they actually say it.
Firstly, their admission: "This man obviously shows many remarkable signs." They're past the point now of sending exploratory missions to the countryside of Galilee to check into rumors about this Teacher; they now accept that He is, in fact, a doer of miracles. Isn't that an interesting turn to observe?
Secondly, the way they say it. In the Greek, John gives their statement about "signs" using the word σημεῖα - a word that almost equally can be translated as "signs" and also - how good is this?! - "flags" and, even, "battle standards." You know what I'm talking about? Those colorful heraldic flags that would go out with regiments and divisions, showing their fighting reputations and qualities?
Let's ride out with Him today, our glorious Standard-Bearer. We have nothing to fear with Him at the head.