User blog comment:KnocknickKnock/Celestial combination attacks with Lucy"s 10 zodiac keys./@comment-3424593-20140310043620/@comment-7418318-20140310153248

Unison Raid:
 * Unison Raid is not something that many people showed during Fairy Tail. Not every combination attack in a Unison Raid. We have only two confirmed cases of Unison Raids in the manga and two more anime-exclusive ones.

Summoning all Spirits and growth:
 * I'm VERY sure that Lucy did summon her spirits before the King, because if they had come by themselves, she wouldn't have collapsed by the power-drain. Also in the fighting festival arc Loke said he was the only one able to come through the gate by his own will and later Horologium said that as Lucy's powers grew, more of her spirits were able to do the same.
 * Which should also tell you something about Lucy's growth actually being growth rather than just free gifts like you seem to claim (that's more of a Natsu thing).
 * And what great growth did all the others show to make you say they grew so much more than Lucy?

Time as a Mage:
 * While it's true she was already a mage before she joined Fairy Tail, that barely affects my statement. :Since her father even insisted on her going to learn economic instead of making a single rice-ball, it's very likely that he wouldn't have allowed her to learn magic, or at least only on her free time in which a child isn't very likely to study and train.
 * She ran away from home a bit less than a year before joining FT and in the time was traveling around a lot and had to earn money (she said she didn't take any with her from home) which leaves very little time for magic training.
 * She joined Fairy Tail in the beginning of July and disappeared on Tenrou in December. That means she was a Fairy Tail member for just six month. Even if we add the full year of running away from home (which we shouldn't for reasones I listed above) that would still put her time as a mage at only one and a half years.
 * And how long have her team members been mages in comparison by the time Lucy joined? Erza: confirmed 8 years, Gray: not known, but he was already an FT member when Erza joined, so more than 8 years, Natsu: unknown, but he joined Fairy Tail 6 years before Lucy.
 * Now if you consider Lucy half as strong as Gray (not too unreasonable I think) got in his 8+ years, it should mean that she should have needed four years to reach that, but at most she was a mage for 1.5 years, meaing she had more than double the growth-rate of Gray. I'd call that pretty amazing.