So in hindsight, what do you think was the purpose of hyping up the Yeti Cool Brothers, or Thriller Bark's General Zombies?
Your post makes it seem like Oda always has some grand masterplan where everything will have its purpose in the end and that he will strictly follow it if not intervened by his editors, when we already know that he's prone to spontaneously add things he thought of, or leave things out for pacing purposes.! https://uploads.tapatalk-cdn.com/20210523/a0e140513ce602a41749e136e5f3efe5.jpg
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The lightning effect is spikey, irregular and visibly on top of Ulti's body, afterwards the whole body is charred and sprinkled with sparks! https://uploads.tapatalk-cdn.com/20210523/f40dc09ef56f9169277ec0623364a384.jpg
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Big Mom's attack is a straight line, Ulti's body has serrated edges that are above and around the attack effect that follow its direction, her body is explicitly smoking from the point of exit, still with serrated edges, and the attack creates an explosion.
Big Mom's Maser Cannon is almost identical to the Pacifistas' and Kizaru's laser attack, which its name also alludes to. Everything points towards Ulti having been properly pierced by the attack.
Laser and lightning semantics aside, neither one puts a character down and out forever.
After this, which includes both the laser through and through and the smoking torso when he falls, Oven took about two chapters to get back up and start fighting again with little more than a scorch mark on his midsection.
I'm pretty sure we'll see Ulti getting back up, and I think it'll be more of a testament to her endurance than a failure on Big Mom's part.