What position is challenged by “allowing the semantic but not the grammatical agent to precede is arbitrary”?

Fronting the Subject: Restriction, Reinforcement and the al-Jurjani–al-Sakkaki Debate

• The claim that agent and object are always identical
• The claim that every fronted noun is a pronoun
• Allowing semantic fronting while forbidding grammatical fronting without justification
• Permitting a postverbal subject