from many of my mom friends whose kids are this age, this is a ver normal phase around 2.5-3 year. the "just one more..." and "but I can't go to bed because xyz"
With our daughter, we finally caught on that short term solutions just fed the problem and soon bedtime had become a nightmare. "one more hug" or cup of water got her fixating on all the things that she just *had* to have before relaxing
we finally did supernanny approach of "it's bedtime" return to bed. Of course, her bedtime routine made sure she had her sippy of water, her friend, her hug, etc. But afterwards, just "it's bedtime" and then return to bed.
She got significantly better after the first few days, but the nighttimes didn't go smoothly consistently,every night, for like a month. Even now, she'll randomly see if she can have "just one more..."
If he's still napping 2+ hours a day, though, that might also be something you check out. What time is he getting up, and how much wake tim ebefore going to bed? My daughter went on a "nap strike" for a few months where she did resttime instead, but now she's falling asleep during rest-time. If we don't have her awake by 3, she's restless at bedtime and just lays there wide awake for awhile