Artem - Sure he got his 2nd chance because of Conor, but then he went on to get the most amount of KO's in TUF history making it to the final, recently he gave the #5 ranked FW a tough fight too, so I'd say he's earned his place, it should also be noted that he has one of the shortest reaches in MMA and has no right to be competing at all with his frame, he's amassed a 5-4 winning record in the UFC (including TUF fights)
Cathal - He amassed a 4-2 winning record in the UFC, not bad for a rugby player who came into MMA later in life. Reached #30 in the WW rankings.
Paddy - He amassed a 3-2 winning record in the UFC, pretty good for a guy with no real athleticism to call on. Reached #11 in the FLW rankings.
Aisling - She amassed a 2-1 winning record in the UFC, probably the least athletic of all the SBG fighters, yet under John Kavahagh she has been ranked as the #2 FLW, #3 SW & #5 BW .
Makwan- He's amassed a 3-1 winning record in the UFC and looks to have the talent to go places, although it seems modleing pays better as he doesn't seem to interested in MMA.
So, it seems that all the undeserving fighters you brought up, who only got where they are due to McGregors influence all have winning records in the UFC....?