I didn’t say he was infallible - that’s the catholic mantra/mindset. Was Moses, Abraham, etc. infallible? No! Did they and others do a mighty work for the Lord? Yes! The work that they were called to do/their destiny.
God used him for His purpose and he fulfilled that purpose. That’s why Catholics are here - to trash that purpose because we see the obvious result of it . And there is no doubt - the difference between His Church and the RCC. Well done, Luther!
It’s already done - the gates of hell shall not prevail against His Church. However few - is not the point - it’s the purity of His Church and that’s without traditions that oppose/nullify His Word.
So it is ultimately up to you to decide which of Luther's teachings were divinely inspired and which were horse hockey? Unless you rely on some "expert advice" I guess that puts the cloak of infallibility on you making you your own pope and magisterium. Are you up to the task? What makes you more qualified than me or anyone else to be able to separate the fly poop from the pepper?