Red Bull Racing only completed 21 laps throughout the four-day Jerez test. (Photo: Getty Images)

only completed 21 laps throughout the four-day test. (Photo: Getty Images)

Amid World Champion Red Bull’s testing nightmare at Jerez, bigwigs Christian Horner, , Helmut Marko and the visiting team owner Dietrich Mateschitz all departed southern Spain.

While rival Mercedes and Ferrari-powered teams have managed to collect dozens upon dozens of early preseason laps, the tally amassed by and in the troubled RB10 numbers 21.

“Adrian has gone back to the drawing board, definitely,” team newcomer Daniel Ricciardo said.

Red Bull had initially pointed the finger at engine supplier Renault, and the French marque duly admitted it has had problems with all of its customer teams, including Toro Rosso and Caterham.

But Marko confessed before departing on Thursday that the latest problems are also Red Bull’s making. Paddock rumors suggest Newey has pushed his famously tight packaging too close to the limit in a new era where cooling is a major hurdle.

“I guess now there’s only so much he (Newey) can do at the track and I think he’s pretty happy working at his office in Milton Keynes,” added Ricciardo. ”I think the break before Bahrain is going to help the team a lot.

“Time is still on our side. Even if we go to Melbourne with whatever (issues), it’s a long season. These guys know how to win and I’m sure we’ll sort it out.”

Undoubtedly, Ricciardo is putting his characteristically-smiling tilt on serious trouble for Red Bull.

There are rumors that before Newey left, he had a “heated” exchange with Renault’s Rob White — each accusing the other of being most to blame for the situation.

And Red Bull’s culpability seemed clearer on Thursday, when sister team Toro Rosso’s Jean-Eric Vergne said a Renault fix had given the new STR9 a “massive step forward” overnight.

Bernie Ecclestone, nonetheless angry at the Jerez testing ‘farce’, sees some upside to the situation.

“The good thing is that the season could be extremely interesting — really unpredictable, and that is the exciting thing,” he told the Daily Mail.

Williams’ Felipe Massa agrees that the 2014 revolution has given a total shakeup.

“As I drove around, you could see these major differences between the cars,” the Brazilian is quoted by Finland’s MTV3.

“I’m not talking about performance, I mean how the cars are braking and how they’re coming out of the corners. It seems as though there are three categories of cars on one track — Mercedes, Ferrari and Renault. Even the sound is different,” he explained.