User blog comment:BobTheDoctor27/February 2013 Update/@comment-5072107-20130312204042

If I remember correctly, a Toa Stone doesn't work like that. The destined Matoran has to bring to stone to a Suva (In the Great Temple, Metru Nui, and Kini Nui, Mata Nui) to be made a Toa.

So basically, if the Matoran who picked it up wasn't destined to be a Toa picked it up, they wouldn't become a Toa.

Also, there's a simple answer to your Velika problem: Don't make him a Great Being. It's an Alternate Universe, so you can do things like that :P