Just as Steve Wozniak's invention wouldn't have been anything more than a simple hobbyist's device without Jobs, Neukirchen's creation wouldn't have had even remotely the same impact without Karp's ideas.
Woz's design was strikingly cheaper and more capable than anything else on the market and then it was successfully marketed as the first personal computer with wide consumer adoption.
In the seven years it's taken Tumblr to exit by acquisition Apple:
Developed and launched the first popular consumer personal computer.
Developed and launched the first popular consumer personal computer with a GUI.
Became highly profitable
Offered the biggest IPO in decades
It's not the same ballpark or game.