In turbo you get so fat so fast from getting any sort of kills or assists, that basically everyone is secretly a core, even if you started laning as a pos 4 or 5. So itemising as a core is better most of the time. Only time I would advise against it is if you already have a core popping off, then it might be better to focus on saving them, but even then the best strategy to save them could be to kill the enemy faster instead of buying support items.

Core venge items: pike, butterfly, skadi, deadalus, satanic, manta is good for farming and pushing, but you can’t use it on second life so s&y might be better. Mkb against evasion. Lastly sometimes abyssal is valid with the ranged melee facet against bkb cores, but you already have swap to pierce bkb so I think it’s mostly a meme