When i play jayce top getting early ganked or solo killed (cuz I love trading and sometimesI troll) at around 3:00, I ll find myself so useless for the rest of the game. When those melee fighters get ahead with a Plated Steelcaps back in lane, they just crush me as Jayce is just super vunerable and does no dmg.
Ima say Riven
Irelia is also in a rough spot but can mount comebacks at Botrk if she stops dying till that. Though the comeback is easier to make mid than top due to the nature of being stat checked more often top.