User blog comment:MagnoCosmos/Celestial Spirits Ranking/@comment-1153699-20150907164700/@comment-1153699-20150907191126

1) Angel was around. And even if she wasn't, it wouldn't have made Gemini any stronger/weaker. If Lucy summons Loke and they get separated, Loke's power would stay the same whether Lucy is near him or not.

2) Gemini was only able to copy Ichiya and (a non-serious) Gray because Angel's MP was, apparently, on the same level as theirs. Gemini's power depends on the owner's power. If Jura was a Celestial Spirit Mage and he would have summoned Gemini, Gemini could have turned into an Erza(and probably even Laxus)-leveled Mage easily. Gemini under Lucy's control however can't do anything even close to that.

3) Lamy was able to deflect his Arrows because Sagittarius simply wasn't strong enough. If Sagittarius was on Natsu's level, do you think Lamy would have been able to deflect the arrows as well? I heavily doubt it.

4) True. Capricorn doesn't have much feats. But I still think he's up there. Taurus is physically the strongest Celestial Spirit so of course he would throw a harder punch. But I doubt Taurus is as agile as Capricorn is.