anyone can deny that because it's a debatable topic. LG/SK/Mibr is the number 1 team in their time but it is achieved with different rosters. No one can deny they were a solid team especially in 2016 - 2017 but everyone would respect it more if it is achieved with 1 roster.
LG; Fer, Fallen, Taco, Cold, FNX
SK: Fer, Fallen, Taco, Cold, FNX (Roster 1). Fer, Fallen, Taco, Cold, Fox (stand-in for the major) (Roster 2). Fer, Fallen, Taco, Cold, felps (Roster 3). Fer, Fallen, Taco, Cold, Boltz (Roster 4).
As you can see, there are 4 different players helping them achieve what they achieved. No one can deny that they were once a good team with incredible players but we can deny that they have an era.