Calling All Munitions and Fighter Plane Experts: Is German Pilot Claim "Air-to-Air Attack" Brought Down MH17 Credible?

Cockpit shows traces of shelling, clean round hole, about 30 mm caliper. Some holes are bent inward, some outward Rivets bent outward Moreover, small cuts can be seen, all bent outward, which hint at the fact that fragments have penetrated the outer hull from the inside of the cockpit

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Calling All Munitions and Fighter Plane Experts: Is German Pilot Claim "Air-to-Air Attack" Brought Down MH17 Credible?