MORE: Spring football content portal Brace yourself: The transfer portal opens this week. Ryan Walters is ready. The second-year Purdue coach no doubt has some holes he’d like to fill on his roster now that he’s getting a good look at his team in spring football, which wraps up this week with practices on Tuesday and Thursday after playing a spring game yesterday. Without a doubt, Purdue will be looking for a punter and long-snapper. As for other needs? The program could be in the market for a rush end, star (CB/S), tight end, defensive lineman and maybe a running back. In addition to adding p…