Any Reason to do this to Leona?

Alistar Base Armor increased from 24.38 to 44

Bard Base armor increased from 25 to 34

Blitzcrank Base armor increased from 24.38 to 44

Nautilus Base AD increased from 57.544 to 65.54 Base armor increased from 26.46 to 35.46

Nami Base armor increased from 19.72 to 29

Janna Base armor increased from 19.384 to 28

Lulu Base armor increased from 19.216 to 28.22

Rakan Base AD increased from 62 to 70 Base armor increased from 24 to 36

Sona Base Armor increased from 20.544 to 30

Soraka Base armor increased from 23.384 to 32

Tahm Kench Base armor increased from 27 to 47

Taric Base armor increased from 25 to 45 Dazzle (E) damage increased from 100/145/190/235/280 to 105/150/195/240/285

Thresh Base AD increased from 47.696 to 56 Base armor increased from 16 to 28

Zilean Base armor increased from 19.134 to 28

Zyra Base armor increased from 20.04 to 29 HP growth incrased from 74 to 79 Base HP increased from 499.32 to 504

Looks like all the supports are getting base stat buffs. Oh hey! What did Leona get?

Leona Eclipse (W) bonus armor increased from 20/30/40/50/60 to 25/35/45/55/65

Why is Leona not getting a large base armor buff? Why only +5 armor in her ability? Alistar gets a 20 armor buff on his BASE stats and Leona gets a 5 bonus armor on her W? Could I get some context as to why Leona is being denied a base stat increase like all the other supports? Am I just missing the increase somewhere? I can't seem to find any information on Leona getting more then this in PBE at this time.