On Tulo, it's been argued that he'd not have opportunity to start for the Cubs. I don't think that's true, apart from merit.
The Cubs have only Baez as a starting middle-infielder. If Tulo was worth starting, he could hypothetically win the other spot. Obviously Baez and Russell are better than Tulo defensively, whether at 2B or SS. But a Baez/Tulo combo, in either configuration, might be as good or better defensively than anything short of Baez/Russell.
The larger question is merit. Sure, Tulo hypothetically *could* win a starting job... *IF* he was healthy and *IF* he could hit. But in his last four seasons at Toronto, he's been no-play in 18, and OPS/OPS+ of .678/80; .761/102; and .697/89 the previous three seasons. So hitting-wise, he's been about as useless as Russell and Hayward.
Perhaps Tulo wouldn't want to try to compete with Bote, Descalzo, Zobrist, and Russell to win that job. But I'd think that might be almost as accessible a starting job as their might be.
I think that given that Russell is suspended for a chunk of the season; that he's been a bad bad hitter for several years; that he too is repeatedly injured; and that his personal-life garbage makes it unclear whether the Cubs will keep him; I think all of that makes it pretty obvious that the 2nd middle-infield starting spot is very wide-open.