His road to conquering– becoming the lion– came through suffering. He didn’t redeem us by keeping his status as a lion, he redeemed us by becoming as humble as a lamb (Go read 1 Peter 1:18-19). If you continue to read after Revelation 5:5, in 5:6 you will see the shift from Jesus being a lion to him being the lamb. We can never fully understand His position as the Lion of Judah until we understand him as the lamb who had to be slain. If you misunderstand his purpose in being the lamb, then you will misunderstand his position in being the lion.