Saylé said:
I think the aura around him would definitely be indicative of his battle power, it couldn't be anything else. Vegeta was just too prideful to admit it.
It wasn't an aura, it was clearly a barrier of some sort, just like 17 used, just like cell uses later.
Vegeta isn't just prideful, cell is suppressing his power.
Chapter: 383 (DBZ 189), P3.1
Context: after Cell defeats Kuririn
Vegeta: “Are you happy to harass a piece of garbage like that? Just like I thought, even after reaching your perfect form you still don’t seem like anything special.”
Chapter: 383 (DBZ 189), P4.8, P5.1, P6.1
Context: after Kuririn says Vegeta will be killed by Cell
Kuririn: “It-it’s true that I’m absolutely nothing special compared to you Saiyans…B-but I can at least tell how strong my opponent is…S-so I know how fearsome he is…Even though I was just barely tapped by him, I know his fearsomeness…! You can’t go by the ki you can feel now…He’s hiding far, far more terrible power…!”
Chapter: 382 (DBZ 188), P11.1-4
No.16: “Cell really did get considerably stronger…But Vegeta’s still better than him at everything!”
Vegeta: “Damn you. You’re not taking this seriously.”
Cell: “I told you I was warming-up.”
Vegeta doesn't think cell's that strong, even 16 probably the most precise chi sensor among them believe vegeta is still stronger at first.