i'll give brenda credit for figuring out how to make suarez & sturridge work although the defense was free as fuck. he eked the most out of what he had last season. but as far as player development i'm not really seeing it. suarez has been suarez since about 2007 and i was extremely disappointed that liverpool ended up w/ him.
sturridge...it depends on how you look at it. i say that in liverpool he found his level and the right opportunities instead of being shunted out on the periphery at chelsea/city. i wouldn't argue too hard against someone giving all the credit to brenda tho.
coutinho...i never saw him at inter so...

i couldn't tell you shit about what he was like then.
just from what i've seen of them in the EPL i really don't think there's much difference between oscar (one of my favorite players around) and coutinho from a talent standpoint. the difference is the application of mourinho's management to complete his game. i don't see brenda stressing the same importance of tactical awareness and unit functionality in his AMs. even Hazard you can see the changes in his game under mourinho. far more direct, confident but his workrate is much better. granted he is much more talented than sterling, oscar or coutinho. so no i don't think sterling or coutinho can reach their potential at liverpool. at least not under the current manager/system.
chelsea develops a bit more than city but there's certainly a baseline level of eliteness you have to live up to or you'll be next out that revolving door. hazard and oscar came ready for it but they were definitely not the finished article. i'd like to see coutinho and sterling at least get that shot.