Here's is a full scaling breakdown of every character who scales from senna's feat;
PRE TIME SKIP CHARACTERS;
Second Fusion Aizen and Third Fusion Aizen would scale to 1.23 yottafoe since he is stronger than sqaud zero.
(3C, Galaxy Level)
Fourth Fusion Aizen and Final Fusion Aizen will scale to 3.68 yottafoe since Fourth Fusion Aizen evolved to the level of the soul king and Final Fusion Aizen surpasses the power of the Soul king.
(3C, Galaxy Level)
With Final Fusion Aizen's ultra fragor, he would be 44.16 Yottafoe for being 12 times more powerful.
(3B, Multi Galaxy Level)
Post-Dangai Training Ichigo scales to 44.16 yottafoe for dispelling ultra fragor and being stronger than Final Fusion Aizen.
(3B, Multi Galaxy Level)
POST TIME SKIP CHARACTERS;
From Descending to Ascending power level rating;
Post-Royal Guard Training Shikai Renji scales to 12.30 zettafoe from downscaling from 123.30 zettafoe for being 10 times weaker than his bankai at most.
(3C, galaxy level)
Post-Royal Guard Training Bankai Renji and Post-Awakening Base Uryu scales to 123.30 Zettafoe [ 30 times (blut + slavkrei vol amp) downscale from 3.68 yottafoe].
(3C, galaxy level)
True Power Senjumaru, Hikifune, Oetsu and Tenjiro, ichibei, Post-Awakening uryu with blut and Post-Royal Guard Training Bankai Renji's Zagai Zekko scale to 1.23 yottafoe [ 3 times slavekrei+ volt amp ] downscale from 3.68 yottafoe ]
(3C, Galaxy level)
Senna ( when releasing all of the Blanks energy at once), Almighty Awakened Yhwach (with or without the almighty), True Zanpakuto Shikai Ichigo, Weakened Soul King and Post-Awakening Uryu blut + Slavekrei volstanding to 3.68 yottafoe [ Main feat ]
(3C, Galaxy Level)
Post-Awakening Uryu with blut + Slavekrei volstanding amped arrows will possibly or likely scale to 18.4 yottafoe since his final arrow destroyed Ichigo’s torso which should be protected by his blut ( 5 times amp). [ Possibly / likely rating]
(3B, Multi Galaxy level)
True Zanpakuto Shikai Ichigo and Almighty Awakened Yhwach scales to 18.4 yotta foe with their blut amp [5 times]. True Zanpakuto Shikai Ichigo with Getsuga Jujishio will also scale 5 times above 3.68 yotta foe (18.4 yottafoe) as well for having overpowered uryu strongest attack and yhwach's ultimate defense.
3B Multi galaxy level
Now the likes of True Zanpakuto Bankai Ichigo, Thousand Year Blood War Arc Aizen, Soul King Absorbed Yhwach, Ikomikomodoe, Kenpachi (Cyfow), Merged Hollow Form Shikai Ichigo, Hikone and Ginjou with amped emotions will scale to 3.68 ronnafoe since they are all comparable to merged hollow shikai ichigo whose cero creinte i.e gran rey cero (10 times amp) × Getsuga tensho (10 times amp)= 100 × senna feat = 3.68 ronnafoe
(3B, Multi galaxy level)
True Zanpakuto Bankai Ichigo, Merged Hollow Shikai Ichigo and Soul King Absorbed Yhwach should be 18.4 ronnafoe via blut (5 times amp of 3.68 ronnafoe)
(3B, Multi galaxy level)
True Zanpakuto Bankai Ichigo + Hollowfication (100 × 100 via reasonings above) 1000 × amp of 3.68 yotta foe = 36.8 ronnafoe.
(3B, Multi galaxy level)
Then the same version of ichigo and Prime Soul king will scale to 5 times 37 ronnafoe ( 184 ronnafoe) with blut.
(3B, Multi galaxy level)
This is my finalized senna feat scaling ramifications, all characters here are identified the same way they are on their profiles so anyone can know specifically what I am talking about.