It's not a "little" behind in gold, having to get QSS by level 6 basically means giving up a BF sword unless you're super fed, and then WW doesn't even have to gank because the enemy ADC wtih 150 AD will be enough to deal with you. If WW doesn't gank you're spending 1200 gold on basically nothing.
Now we are just getting into theory crafting which is just if's and possible scenarios.
If the ww doesn't gank your lane at least once then he's just bad or you are bad and aren't a threat and are losing your lane.
Let's say he ganks you just once. That's a ton of xp and gold to miss.
Not to mention in team fights if you get ulted first or anytime at all.
I'll end it saying I personally like qss against suppression.
Before suppression ww was literally useless with his ult when people ran flash/boost.