The narrow path comment I think is best understood to relate to the Jews of his time. Few indeed found the Way. I don't see it as a general statement or maxim of how it would be for all peoples of all times and in fact I see the Kingdom as a small mustard seed that grows to be the biggest tree around as well as something that will leaven the whole lump of dough of the world and radically change it for the better and of the increase of his kingdom there is no end and . . . just a few scriptures about the victorious advance of God's kingdom on earth.
But to answer your question, no, they are not better or more deserving, maybe just more lucky than those who didn't hear at all.
Grey areas? Well yes, I'm working through my own beliefs about what one must know to be saved and am entertaining the ideas of how the Gospel might look had it been taken to India (some say by Jesus himself) and contextualized for that culture. I'm willing to venture the Gospel may be hardly recognizable in that culture to us in the West.
More "lucky"? I could quote you a verse that seem to do away with 'luck':
1 Corinthians 15:22-28 (Young's Literal Translation)
22for even as in Adam all die, so also in the Christ all shall be made alive,
23and each in his proper order, a first-fruit Christ, afterwards those who are the Christ's, in his presence,
24then -- the end, when he may deliver up the reign to God, even the Father, when he may have made useless all rule, and all authority and power --
25for it behoveth him to reign till he may have put all the enemies under his feet --
26the last enemy is done away -- death;
27for all things He did put under his feet, and, when one may say that all things have been subjected, [it is] evident that He is excepted who did subject the all things to him,
28and when the all things may be subjected to him, then the Son also himself shall be subject to Him, who did subject to him the all things, that God may be the all in all.
How do you explain this?