Why at best? Tell me 20 teams better than them. Ofc they are not TierS (Navi, Faze or Cloud9), but they can totally put a fight against Tier 1 Ence, Vitality, G2, Furia, NIP, Heroic or Spirit that are the rest of Top 10 getting like 50% chances to win any game against them.
And they would totally win more than 50% against the rest of Top 20 (Big, Astralis, OG, Liquid, Imperial, Outsiders, Mouz, Movistar Riders, Finest or MIBR)
They had no team to win a Tier 1 event, but that doesn't mean they are not Tier 1 team, someone buying the entire roster and then doing some adjustments like giving them better facilities/preparation/analysts could give a little boost and then see if they should change X player or something would be another extra push to try to get inside top3.