Ever since BF4 came out, it seems like the scoring system in all the subsequent BF game has been very different to say the least. Seldom does the person with the most kills ever get the top spot, and people with very few kills or sometimes zero kills are able to claim a top spot on the scoreboard. Most of it seems due to arbitrary points obtained your "squad", contributing to something that shouldn't even be in the game in the first place (V1 Rocket), albeit this is new to the BF series with BFV and was not in BF4 or BF1.
It was typical that in the prior BF games, such as Bad Company 2 and Battlefield 3, that the best players would be on the top of the scoreboard. Now, not so much and depending on the game mode or how the game plays out, as well as how the other players are contributing, the scoreboard seems to provide a poor glimpse into how the match went. I look to the scoreboard for a brief summary of how everyone is doing, and since BF4 it has provided a seemingly insignificant descending order combined with a randomized list of kills and deaths.