Ah context…
You want an omega account to be able to train 3 chars on 1 account. If you split the skilling (and god knows I don’t see the point of that) you basically splitting the skilling between 3 chars on the omega account does mean an alpha will get ahead but only up to just below 6mil sp.
However I do not have that problem. I have a few accounts and I need them to active at the same time. So I will never have your issue. My OMEGA account will always gain more sp faster than an alpha.
His premise is also flawed. By trying to train 3 chars on one account, splitting the skilling time, he should do the same for alpha. 3 chars one alpha account and see how far that gets him.