The problem is that she wasn't fighting alone, she had the other servants with her and Holmes,
Holmes... literally couldn't fight in LB5.2, all he did was give Musashi something to help her see an attack coming and otherwise stayed in the background... that's the LAST PLACE you can be to help someone who can move as fast as Light.
Besides, how the hell is having more people be helpful against someone whose faster than everyone else combined casually? Did this person watch Stone Ocean? Because that damn sure didn't help anyone against Pucci with Made in Heaven.
who got mentioned that was distracting the servants wit his light and was shown able to buff musashi to react to Dioscuri attack in their first encounter
No? All Holmes did was give Musashi a Magecraft spell to help her see Castor's extremely quick instant kill attack coming towards Mash:
This ignores that afterwards, Musashi was dealing with both Castor AND Pollux attacking her at the same time, something that a simple support spell wouldn't be able to accomplish against TWO Lightspeed users(Unless you believe Nasuverse Mages have easy access to precognition granting spells... which just makes the downplay towards the franchise more retarded).
I also though she had a buff too using one poseidon cores and her trident?
Why would that matter when it comes to the SPEED of the opposite opponent who can move as fast as Light?
Not too sure about that one, might be misremembering. Nanomachines are a fairly decent buff considering Charlotte was able to go from not beating a single regular beast to one shotting the Cerberus that was giving a bunch of problems to a team of servants.
That was due to the Zeus Klironmia going full blast and all that did was cause the Demeter Klironmia to go haywire and kill the Cerebus... and that was going to kill Charlotte because she isn't Divinity while Lostbelt Chiron, the man who could barely handle a dying Achilles, could use at full blast with no side effects.
I mean it's possible. He does use it if he really needs it like with the Grail but it's a thing he doesn't just use it on anyone without him having some respect for them.
That's not actually true...
Yes, Gilgamesh does not like drawing out Ea against anyone... but it's not that hard to gain Gilgamesh's "respect" for him to use it on you. Hell, the UBW anime had Gilgamesh literally pull out Ea just to grandstand that the "Faker"(Shirou) can't copy it and how below him he is. Again, Nasu allowed that to happen and we know he has vetoing power if he really doesn't want it to happen.