no, guardian was average 1.6 player and was never succesfull not even in CZ/SK except some 1v1 league.
On the other hand source was way to easier than 1.6, so for all players which started with 1.6 was source so easy to play, so almost instantly they could beat some asses.
Thats part of the reason why 1.6 players dominated csgo so much. Only one exception is french scene which came from source not from 1.6
And also if you are comparing oskar vs. guardian which came from same cs region. It was actually oskar, who was number one in their region and who loved to waste his talent on some shit like dota etc.