There is literally no one who can win at online poker who won't crush stakes ~ 10X as high in live poker, unless they have some bizarro personality disorder where they can't think rationally around real people. for instance, the play in your basic $400 BI mtt is probably equivalent to a $10 MTT on a major site. Winning NL25 players can beat $2/$5 live.

There are tons of live players who can be break-even or slightly winning regs who will get destroyed at micro-limits online.