Holloway playing in the backrow historically disappears - his involvements were never enough, when he was moved to lock he started playing tighter and getting more/better involvements
I can't see him in the backrow at test level, we have better, higher workrate options
Now as a test lock, he just isn't big enough, because his good field work at test level is expected, but a good test lock is just bigger and more effective
I rate him as a good super rugby standard lock, but we have better, more effective options at test level.
His only spot in a test team IMHO is a 5/6 bench option, and then he is competing against the Leota, Hanigan options etc