SELECT "Years for Grizzlies" FROM table_8518 WHERE "Player" = 'obinna ekezie'
What are years that Obinna Ekezie played for the Grizzlies?
CREATE TABLE table_8518 (
    "Player" text,
    "Nationality" text,
    "Position" text,
    "Years for Grizzlies" text,
    "School/Club Team" text
)