He is entitled to play whatever he wants, however… if he thinks abe is bad he is wrong haha. Abe is more skill based in that you have to initially find the monster with no aids. Either wait untill he improves, or let him play a game with a good Abe on his team whilst he plays another role. Abe IMO is the best trapper by far, maggie is also very strong but I feel Abe is overall better once you get the hang on tracking yourself instead of relying on daisy. Griffin however, really isnt that great compared to the other 2 .
I would tell him this. Abe rely’s on skill and map knowledge to initially find the monster. If you are dealing with a sneaker just tag all wildlife in sight and spread out around the map, you will find him eventually.
Once you have a tag on him, stay on him and keep re-applying a tag. Keep checking the mini map and look for dead ends where you can cut him off. The dart is by far the best tool for chasing and getting domes on the monster. Once you have him domed, keep applying the dart every 20 secs or so, this means you will never loose track of the monster in the dome and is very helpful against wraith. Next make sure you are continuously spamming stasis grenades to slow the monster, these are extremely effective against all monsters, and whilst the monster is slowed, you can do damage with the shotgun which does pretty nice damage. Remember the grenades are more important than the shotgun, and the dart is more important than anything, even a dome. Because as long as you maintain a dart on him, you are not going to loose him.
Say for example you have found the monster but he is not darted, and you want to go for a dome but he might not be close enough, always dart first. If you miss the dome and he runs, you have lost him again, if you dart him, you can then stay on him until you can get a easy dome on him.
Hope some of this helps, but remember he doesn’t have to play abe if he likes the others, just make sure he knows what hes missing out on