Player A went 5-36 in his first 10 games, with 1 homer and 3 RBIs.
659 homers later, Willie Mays finished up a Hall of Fame career.
Seems to me Pedroia got off to a very tough start too.
I am in no way comparing these players, but it is way too early to make any assessments about Yoshida. Not everyone hits the ground running like the immortal Ted Cox.