There is always more than ONE answer as long as it is supported by correct facts.
All you said so far has been completely wrong.
Lust vs Greed. I don't mind that you think Lust's spears can pierce Greed's shield. This question has multiple possible answers. There is an answer where Lust can pierce Greed. There is an answer where Greed's shield breaks Lust's spears. There is an answer where they both cancel each other out and the universe explodes. You went with the first one where Lust can pierce Greed but Greed will still win because all Lust can do is STAB. WRONG!!!! Lust can do more than just stab. Lust STABS and SLICES. Lust sliced Mustang's gun and cheek. Lust sliced the water pipe, and Lust sliced Barry the Chopper. If Lust wanted to, she could have sliced Mustang's head off. She is not limited to only stabs. She STABS and SLICES.
Warth vs Greed. You think Wrath can defeat fully armored Ultimate Shield Greed. Again, that is not the problem. Yes, you are right. Wrath is a much better fighter. But then I asked you how exactly Wrath would defeat the Ultimate Shield. You said Greed would get tired and drop the shield. WRONG!!!! Homunculi don't get tired. Does Envy get so tired that he can't transform? Does Lust get so tired that she can not use the Ultimate Spear? Does Pride get so tired he can't use his shadows? NO!!!!!
And of course, you were wrong with the whole Trisha thing.
See? The problem is not that there is 1 answer. There are more. But what you said was incorrect.