Groves was green as well at that point, but given what Degale has gone on to do, that is a better win than Eubank, who has fallen short at world level. Groves also has Glen Johnson on his record, who has achieved waaaayyyy more than Eubank and you could even make the case for Fedor Chudinov. Likewise, you could make the case for Saunders' wins over Andy Lee or Lemieux being more impressive. Saunders may have schooled Lemieux but he was schooling Eubank until he gassed in the later rounds. Using the same triangle theory, Lemieux flattened Spike in one, who had hurt Eubank and lasted 7 before being pulled out on his stool. Lemieux also has wins over Curtis Stevens and Hassan N'Dam, mucch better fighters than anyone young Christopher has beaten.
My theory is Junior was a better boxer before he turned pro fresh off working with McCallum and the Mayweathers (before picking up bad habits), and that allowed him to outbox James