Talk:Affinity/@comment-2604:2D80:8810:803C:B14D:8801:FC24:7DA-20180908181616/@comment-68.151.181.123-20180923023358

Your experiment is flawed. Whether you or a teamate kills an enemy, you will get the same XP, but how that XP is distributed will change.

If you kill an enemy with a Warframe ability (Saryn Spore, Ocatvia Mallet, Mesa Peacemaker, et cetera) 100% of the XP goes to the frame, 0% to your weapons. This is the fastest way to level a frame, and your weapons will not level much, if at all.

If you kill an enemy with a weapon, 50% of the XP goes to the frame, 50% goes to the weapon.

If a teamate kills an enemy in any way, and you are in affinity range, 25% of the XP goes to the frame and 75% is split between your equipped weapons. This is the situation in your experiment. You said you had a single max rank weapon equipped, so that weapon is getting 3/4 of the XP from your teamate's kills, which is why your frame is levelling slower. If that max rank weapon has a focus lens on it, the XP is converted to focus. If that max rank weapon has no focus lens equipped, that XP actually just vanishes into the ether and does nothing.