F.Edelgard is something like 1 in 37 colourless stones; axe Morgan should be around 1 in 25 green stones. I’m going to assume 4.5 orbs a pull so with 600 orbs you’re at 133 summons, and a few of them were neither green nor colourless. You will see about 3 colourless stones for every 2 green stones, so if we say 126 summons were green or colourless, 84 were colourless and 42 were green. The expected result is 2 copies of F.Edelgard and 1-2 of axe Morgan. Any more, and you’re running good. Any less, and you’re running bad. But you said +1 on both of the focus units? So that’s really close to what you should have expected for 600 orbs.
3% banners with four focus units are like this. It looks like your expectations were not mathematically sound.
I’m about three months back into the game and definitely feel the weakness in my roster. I do think this is one of the bigger problems in this game, that it takes at least several months just to have the most important mythics and some other pivotal 5* exclusives and copies of units good to merge and the seals currently most important. It’s one of my biggest complaints about the game.