Hardiman, Fennelly, Murray and Dehnam all sat on the Lobe & Osayance case as well. They all rejected the Lobe & Osayande application, save Fennelly. The only difference is Kearns, who was not on the court at the time.
The L&O case was, additionally, heard by Geoghan and McGuineass, the later now retired, and the former Chief Justice, Ronan Keane.
Your second point totally betrays your understanding Judicial Review. The Supreme Court will not be replacing their view of proportionality for that of the Minister. It is merely a matter that the Minister has to consider. As long as that consideration does not, effectively, fly in the face of logic, they will not alter the decision.
As for Hardimans views, they were not shared by the majority of the Court. Additionally, he has, in my view, a traditional
PD, "the world is ending" view of immigration.
By the way, anyone familiar with the Supreme Court would tell you they are the most unadventurous, state friendly lot for decades.