are you guys sure blockstun isnt static crouching/standing? and Yeah, level 3 moves have 16f of blockstun, so 5B 214D and 2C 214D will have the same frame gap. 5C 214D, 5D(1) 214D, 6C 2147D, 3C 214D All have smaller gaps (by 2f)
If you REALLY want dead spike, 5D(2) Is level 5, 20f blockstun. The pushback generally forces optimal spacing to tag people while they try to jump out with dead spike's triangular hitbox, so with 28f startup on dead spike, you have an 8f gap without IB/Barrier differences.
if your opponent is watching for high/low/throw, you can generally get a dead spike in at close range. Ragna is not /really/ a free "lmao ill do whatever" (sorry alan) character, he has the options but you have to be able to know what to do, when to do it and not get read like a fucking book