Hector's Spear being the outlier makes no sense though...
Why the hell would we scale a Servant directly to an NP? Not any NP, an NP of similar rank to their STR. After NPs have been said again and again to be stronger than normal attacks. After they keep getting treated like trump cards and when their power is really low, like Antares Snipe, or their use is something else, like Rule Breaker, we get outright told this fact?
How about B rank Blasted Tree? In the novel, Kairi wastes a Command Seal teleporting Mordred the hell out of there. In the anime, to raise her defense as much as possible so she doesn't die, and still it did some damage. The same Mordred with A rank Endurance like Heracles.
Edit: Here is the specific bit. Caules intends to use his Command Spell to Empower Fran and make sure she kills Mordred.
But Kairi uses his to teleport Mordred out of the area of attack. As the narration says, the command spell bent space so the attack would still hit Mordred so that Caules order was followed, but all of the mana was spent doing that and it didn't make Blasted Tree any stronger. On top of that, Kairi mentions that the attack not only homed on her, it tried to drag her back to the center, most likely to take the full power of the attack, but it obviously failed. Despite this, Mordred took very severe injuries. Further implied when Saber mentions Kairi could have used his Command Seal sooner, or Caules that if he had used his sooner or Kairi had taken more time, he could have succeeded.
But despite not taking the full brunt, Mordred still got hit pretty damn hard. MEANWHILE, Heracles doesn't even get tickled by being near the epicenter of the explosion of a stronger NP. Nah fam, this ain't it.