Gracias!
Very lenghty and satisfying answer.
So basicly it is not true that the security of multi-pow coins like myriadcoin and digibytecoin are better than standard single-algo coins? Why do they market themselves with better security? Is it to trick people? I have bought many DGB so i hope it was a good choice.
It is my feeling that they are not more secure but then that depends on various things.
Has Myriad attracted more hash in its current form than it would have if it were yet another single-algo coin? Yes, probably, and this alone possible makes multi-algo more secure for that specific unique scenario (at least for now - maybe not after the hype wears off?) though not for subsequent coins that do the same thing necessarily.
As for why they marketed themselves as having better security, perhaps they believe(d) it to be true, either because they missed something (it happens to the best of us) which is easy to do in a complex code base, especially if you are not 100% familiar with how everything gels together, or because they know something I don't ,only time will tell on that one I guess - However I'd rather be wrong about it being insecure than assume it is secure and be wrong on that, the second has far worse consequences.
Or maybe they know it is not more secure but don't care, I don't know the people in question so I can't say anything for sure.
While I don't believe I am mistaken about multi-algo nothing is impossible so I am not going to point fingers at other people, but rather I am going to focus on what is important from my perspective, from my perspective I care only about the coins on which I work and I will not implement something that I do not believe will 100% work for this coin in the long term.
So I'm afraid these are not really questions I can answer for you in a meaningful way, they are things you should ask yourself or take up with the developers of the coins in question