Don't sweat it man, TBH Felgrand is not even a staple card for this deck, Red eyes Slasher works better with huge monster like BLS-SS or elemental hero decks focused on Neos
You can use alternatives to Blazeman though, Woodsman works for me :) not hard to protect it for a turn if u need too then get that poly, he can also recycle poly cause he lets you add from the GY too
Guardian isnt that "good" because he's meant to be played in a certain style & definitely isn't meant to be some comeback monster. He is STILL useful, just sorta situational. There's the slept on Swamp Battle King that actually CAN be a OTKO monster, if you really looking for one.