Nothing indicates that he will ever be able to reach that level, let alone beat someone like Marco, just because he is now Luffys ally doesnt mean he will ever have to fight someone as strong as Marco, his pre-final fight enemy or final fight enemy as an ally of Luffy doesnt have to be exactly an top-tier, that's wishful thinking, its not like anyone can be a top-tier, if anything his fight and also Bartolomeos EoS fight can easily be against Doflamingo +/- level opponents and nothing is weird here, they are far cry from that level currently and by EoS them fighting against Doflamingo/Jozu power level fighters is completely okay with me, just because someone is in Luffys crew or is allied with Luffy doesnt mean that he/she will immediately fight with a top-tier, that's stupid as ****, that's like saying Nami can reach the level of Doflamingo or Kuma just because she is in Luffy's crew or Chopper for example?
To answer it shortly no, not everyone is becoming a top-tier level fighter, the only ones by EoS that I see stronger than the likes of Marco or Beckman are the M3 other than that no.