when.js promise callback nesting question

examples.js

// I saw an example like this, but I don't like the nesting.
getThing().then(function(thing) {
  return when.all(thing.ids.map(function(id) {
    return getSubThing(id);
  })).then(function(subthings) {
    // doSomething(thing, subthings);
  });
});

// Can `thing` be passed to when.all and this the next .then() ?
getThing().then(function(thing) {
  return when.all(thing, thing.ids.map(function(id) {
    return getSubThing(id);
  }));
}).then(function(thing, subthings) {
  // doSomething(thing, subthings);
});

// Do I need to concat `thing` and the array of subthings into one array?
getThing().then(function(thing) {
  return when.all([thing].concat(thing.ids.map(function(id) {
    return getSubThing(id);
  }));
}).then(function(thing, subthings) {
  // doSomething(thing, subthings);
});

// Or would I use when.join with when.map like this?
getThing().then(function(thing) {
  return when.join(thing, when.map(thing.ids, function(id) {
    return getSubThing(id);
  });
}).then(function(thing, subthings) {
  // doSomething(thing, subthings);
});

Two variants using join/spread:

getThing().then(function (thing) {
    // This is slightly deceptive, in that spread will
    // resolve the contents of this array for you
  return [thing, when.map(thing.ids, getSubThing)];
}).spread(doSomething);

// To be more explicit:
getThing().then(function (thing) {
  return when.join(thing, when.map(thing.ids, getSubThing));
}).spread(doSomething);