A failed medical saw Hull miss out on the then Burnley striker.
"Our loss is QPR's gain," said Bruce.
"Not only has he done as much as anyone this year but last season he scored the goals that got them into the Premier League. That is what he was brought in to do.
"We'd identified him. I think he would have been a real terrific player for us, as he has proved. He is a goalscorer with a fantastic attitude."
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